a microscope that maintains focus when the objective magnification is increased is called
Answer:
It is called parafocal.
A parafocal microscope
order the components to
show how energy and matter cycle through the kingfisher's ecosystem.
a. aquatic invertebrates
d. aquatic plants
b. kingfisher
e. fish
c. sunlight
d Energy Flow
Answer:
Sunlight > Aquatic plants > Aquatic invertebrates > Fish > Kingfisher
Explanation:
The food chain starts with producers who are capable of producing their own food with help of sunlight. Then aquatic invertebrates, tishes and kingfisher being the successive consumers. This is how the energy and matter flows in a kingfisher's ecosystem.
why are DNA and RNA considered as acids?
Answer:
DNA and RNA are both considered acids because they are formed from phosphate groups.
Explanation:
These phosphates can readily remove a proton and make the DNA and RNA highly acidic. The nucleotides of DNA and RNA are composed of both the basic and acidic subunits.
HELP
demonstrate the law of independent assortment by listing the 4 alleles that are produced when a pea plant with the Genotype YyRr produces gametes
Answer:
Mendel used the dihybrid cross between a homozygous pea plant with yellow round seeds and a homozygous pea plant with green wrinkled seeds. The parents have the alleles YYRR and yyrr, respectively.
During meiosis, the chromosomes are separated so that only half the genes are transported to the gametes. The possible genotypes of the gametes then become YR and yr.
As the parents are crossed, the fusion of the gametes results in the F1 hybrid with the YyRr genotype.
Explanation:
The F1 hybrids have the phenotype of yellow round seeds as the dominant allele Y for yellow color, and the dominant allele R for the roundness is expressed.
The alleles in F1 hybrids can now be segregated into four parts; Y for yellow color, y for green color, R for roundness, and r for wrinkledness.
The four alleles can combine in several combinations to produce different genotypes and phenotypes.
On further crossing, four types of gametes can be formed; YR, Yr, yR, and yr. These gametes fuse to form sixteen individuals in the F2 generation.
The ratio of the F2 hybrids is 9 yellow round: 3 yellow wrinkled: 3 green round: 1 green wrinkled.
This proves that both characters are inherited independently of one another and are expressed according to their dominance.
are most chemical reactions in living cells at equilibrium
No, equilibrium chemical reactions do not exist in living cells.
Define chemical equilibrium.Chemical equilibrium refers to the situation in a chemical reaction where both the reactants and products are present in concentrations that have no further tendency to change over time, preventing any discernible change in the system's properties. When the forward reaction and the reverse reaction go forward at the same speed, this condition results. The forward and backward reactions typically have equal, if not zero, reaction rates. The concentrations of the reactants and products do not change on a net basis as a result. Dynamic equilibrium is the name given to such a situation.
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complete question is "Are most chemical reactions in living cells at equilibrium in living cell."
Which of the following is NOT part of the Cell Theory? O Cells are the basic unit of life (structure and function) in all living things O All cells have a nucleus containing genetic information O All living things are made of 1 or more cells O All cells come from existing cells
Answer:
All Cells have a nucleus containing genetic information
Explanation:
whats hypermobility
Answer:
its when your joints move beyond the normal range of motion
Explanation:
Answer:
Hypermobility or being “double jointed” refers to joints that move beyond the normal range of motion.
Explanation:
how many grams of NaCI are needed to prepare a 250ml of a 0.50 M solution
Answer:
Explanation:
250ml=0.25 liter
0.50M means there is 0.50 mole of NaCl for every 1 liter of solvent.
If so, I need (0.25*0.50) mole of NaCl to make 0.50M soln
0.25*0.50=0.125mole
number of mole= given mass/formula mass, therefore for Nacl:
0.125=X/58.44
x=7.305
you need 7.305 gram of NaCl
The mass of NaCl required is 7.31 g
What is the mass in grams of NaCl required to prepare 250ml of a 0.50 M ?The mass of NaCl required is obtained from the molarity and volume of the solution as follows:
Molarity = number of moles/volume(in Liters)Number of moles of NaCl present in 250ml of a 0.50 M wil be:
Number of moles = molarity * volume
volume of solution = 250 mL = 0.25 L
Number of moles = 0.25 * 0.5
Number of moles = 0.125 moles
Number of moles = mass/ molar massmass = number of moles * molar mass
Molar mass of NaCl = 58.5 g/mol
mass = 0.125 * 58.5
Mass = 7.31 g
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who is good a biology
Which form of energy is used by all living things? mechanical electrical light chemical
Answer:
Chemical Energy!
Explanation:
chemical energy is in all living things - i think that most things would pass away without it due to the fact that we kind of need it to grown and stuff
Answer:
Chemical
Explanation:
It is needed by all living things and every living cell to carry out life processes, such as breaking down and building up molecules, and transporting many molecules across cell membranes. The form of energy that living things need for these processes is chemical energy, and it comes from food.
Hope this helped and have a good day
Sexual reproduction ____ variation and selective breeding ____ variation
A.) increases, decreases
B.) increases, increases
C.) decreases, decreases
D.) decreases, increases
Answer:
Explanation:
sexual reproduction increases variation and selective breeding decrease variation
Answer:
its a
Explanation:
trust
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What is the population density?_______
Answer:
Population density is a measurement of population per unit area.
Explanation:
Why didn't snow think that miasma theory could explain the initial cases of john harnold and mr blenkinsopp in the 1848 cholera outbreak?
The main reason why Snow thinks that the miasma theory could explain the initial cases of John Harold and Mr. Blenkinsop in the 1848 cholera outbreak is that the air was bad during the time.
This is a result of the belief that diseases are produced due to unhealthy or polluted vapors from the earth or as a by-product of decomposed material.
What is the Miasma Theory?This refers to the obsolete medical theory that believes that diseases were caused by bad air known as miasma.
Hence, we can see that The main reason why Snow thinks that the miasma theory could explain the initial cases of John Harold and Mr. Blenkinsop in the 1848 cholera outbreak is that the air was bad during the time.
This is a result of the belief that diseases are produced due to unhealthy or polluted vapors from the earth or as a by-product of decomposed material.
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Answer:The first cholera casualty was a man who had traveled from Hamburg, a city that was battling cholera at the time. Since there had been no cholera in England for years before, it is reasonabe to hypothesize that John Harnold brought cholera to England from the European continent.
Explanation:
9.
Wakeny
2015 Encyclopaedia Britannica, inc
If 27,500 Kj is at the producer level how many Kj are available for the secondary
consumers ?
By being consumed by another organism, organic molecules from one organism's body can transfer energy from one trophic level to the next. But typically, there is not a particularly effective way to move energy between trophic levels.
The energy stored as biomass at one trophic level, such as primary producers, only accounts for 10% of the energy stored in the following trophic level (e.g., primary consumers).
In other terms, as trophic levels rise, net production falls by a factor of 10.
First-level trophic level members are producers. In the second trophic level, there are primary consumers. The third trophic level has secondary consumers. Because they are at a low trophic level than Tertiary Consumers, Secondary Consumers receive more energy.Since 27,500 Kj energy is present at the producer level, 10% of it will be available at the primary consumer level. This accounts for 2750 Kj of energy.Now, 10% of 2750 Kj of energy will be available at the secondary consumer level. This is equivalent to 275 Kj of energy.Learn more about trophic levels here:
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Why is energy required for living things? How
do living things obtain energy?
Answer:
by eating food and sleeping
Which membrane transport process increases the surface area of a cell?
Answer: Microvilli
Explanation:
The main role of microvilli is to increase the area of a membrane through which the cell can absorb nutrients. Nutrients from digested food are absorbed into the cells of the intestines.
Membrane Exocytosis
Explanation:It increases PM Area during Cell Spreading. It is found that the total cell surface area increased by about 20% through exocytosis during cytokinesis. The furrowing observed during cytokinesis was indispensable for the cell membrane increase, and vice versa.
PLEASE HURRY, I'LL GIVE YOU 50 POINTS! Which two cell structures are found in eukaryotic cells but not in prokaryotic cells?
Choose two:
A) Plasma membrane
B) Nucleus
C) Mitochondrion
D) Cytoplasm
A new sea star species has been identified in Australia. This species is a hermaphrodite that self-fertilizes and keeps its young inside of its body. Other species of sea stars in this genus have both male and female sea stars. They release eggs and sperm into the water where the egg is fertilized. How does the new sea star species influence our understanding of biology? Select all that apply.
A.
It shows that populations of organisms share the same habitat.
B.
It shows that populations of organisms in a community stay the same.
C.
It shows that populations of organisms can separate into new species.
D.
It shows that populations of organisms have a certain carrying capacity.
E.
It shows that populations of organisms interact with the nonliving environment.
F.
It shows that populations of organisms have individuals that form with new traits.
The new sea star species influence our understanding of biology It shows that populations of organisms have individuals that form with new traits.
Why are sea stars a keystone species?
In Australia, a brand-new species of sea star has been discovered. This species is a hermaphrodite that carries its eggs inside of its body and self-fertilizes. There are male and female sea stars in other species of sea stars in this genus. In the water, when the egg is fertilized, they discharge eggs and sperm.
Ochre Sea Star. A keystone species is an organism that helps define an entire ecosystem. By keeping populations of mussels and barnacles in check, this sea star helps ensure healthy populations of seaweeds and the communities that feed on them—sea urchins, sea snails, limpets, and bivalves.
Sea stars are important members of the marine environment and are considered a keystone species.
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Explain the anatomical concepts associated with human development
The anatomical concepts associated with human development deals with the ways and different processes in which the body developed from a zygote which is formed from the fusion of the male and female gamete.
What is Development?This is defined as the prices in which the body grows into maturity from the pregnancy stage to adulthood and it starts with the fertilization process which results in the implantation of the zygote in the uterus.
After some weeks, the parts of the body are formed and are usually visible when a scan is done and the body are formed with adequate supply of nutrients in the body which enhances the process of cell division such as mitosis which is responsible for the growth and repair of worn out tissues.
This concept of growth is how humans develop as a result of organs such as the brain etc being involved in this process also which explains how the anatomical concepts are associated with human development.
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True or False Heat or thermal energy can only come from burning wood
Answer:
true
Explanation:
because burning woods provides heat
6. Adding plant food to a lawn affects the height of grass. What is the independent variable?
a. The height of the grass
b. The plant food
c. The temperature of the weather
7. Adding plant food to a lawn affects the height of grass. What is one control you would need to
The independent variable here is option b. the plant food.
In the given experiment, the hypothesis is whether adding plant food to the lawn affects the height of the grass.
The dependent variable that will reflect changes due to alterations in other variables would be the height of the grass.
To determine the cause of one factor over another in experiments, two variables are required. The independent and dependent variables are these. In an experimental study, the independent variable can be changed, manipulated, or adjusted. On another variable, which is a dependent variable, the impact of such manipulation is shown. The outcome of the experiment can be determined by tracking changes in the dependent variable.The cause is the independent variable. Its value is unaffected by the other study variables. The effect is the dependent variable.Hence, the independent variable here is option b. the plant food.
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Step 1: took ten leaves from a plant
Step 2: weighed all ten leaves
Step 3: hung the leaves up in a classroom for 4 days
Step 4: weighed all ten leaves again
Step 5: calculated the mass of water lost by the leaves
Step 6: repeated steps 1 to 5 with grease spread on the upper surfaces of the leaves
Step 7: repeated steps 1 to 5 with grease spread on both the upper and lower surfaces
of the leaves.
All the leaves were taken from the same type of plant.
Table 2 shows, the student's results.
Table 2
Treatment of leaves
Mass of water the
leaves lost in g
0.98
No grease was used on the leaves
Grease on upper surfaces of the leaves
0.86
Grease on upper and lower surfaces of the leaves
0.01
What mass of water was lost in 4 days through the upper surfaces of the leaves?
[1 mark]
Answer:
i dont understand what is this
Scenario: Researchers posted ads in the newspaper to recruit participants for their study of a new treatment for agoraphobia (the fear of open places). 87 people responded to the ad, but only 60 of those actually reported being agoraphobics. Of the sixty, 20 were randomly placed in a condition (NEW) in which they received the new treatment. It was explained to the NEW participants that the treatment they would be receiving was promising but new, so they would be monitored carefully to watch for any undesirable side effects. Twenty other participants were assigned to a condition (OLD) in which they received an older, more traditional form of treatment. These participants were told that they were not receiving the new treatment but an older treatment that had been around for awhile, so the chances of side effects were minimal. Finally, 20 other participants were randomly assigned to a group (NO) that received no therapy. After six months of treatment, researchers found that the participants in the NEW condition were exhibiting 64% fewer symptoms of agoraphobia than before they started the treatment. Participants in the OLD condition were exhibiting 42% fewer symptoms, and participants who did not receive therapy exhibited 22% fewer symptoms than six months ago. Researchers were pleased with the results, concluding in an article they were writing that a new treatment had been found that will be more successful with agoraphobics than previous treatments.
Question #1- do you agree with the conclusion of the researchers? write a paragraph describing an alternative explanation for the result
Question 2- also write a paragraph describing how the experiment might have been designed so as to rule out the alternative explanation that you provided
Yes i agree with the conclusion made by the scientists on the experiment for agoraphobia.
This could be due to psychological factors
:Another explanation could be that each patients' levels of this phobia is variable . However, comparing the findings of each one is more likely to occur if the patients' levels of phobia are equal. To determine whether the tests are effective vs if nothing is done to address the problem, the "none" is compared to the tests. To compare with the "new," the "old" is present. It would be inefficient and necessary to eliminate the "new" if it is neither better nor worse than the old.
Agoraphobia is a fear of being in precarious situations or of not being able to get aid if something goes wrong. A person with agoraphobia could be afraid of riding public transportation.A tragic childhood event, such losing a parent or experiencing sexual assault. suffering a stressful incident, such as a death in the family, a divorce, . a history of mental diseases including depression, bulimia, or anorexia nervosa. misuse of drugs or alcohol.
randomization guarantees that every patient has an equal chance of receiving any of the therapies being studied. It also creates comparable intervention groups.
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How does most carbon get released back into the atmosphere during the geological carbon cycle?
A. Volcanoes
B. Dead plants & animals
C. Erosion of rocks and minerals
D. Combustion of fossil fuels a over a short period of time
If you are conducting visual examination of what particular causal pathogen it affect plant diseases. What are the important points or information you must gathered to ensure that your diagnosis are reliable. List the steps and explain.
A pathogen such as a fungus, bacterium, mycoplasma, virus, viroid, nematode, or parasitic flowering plant, is what causes infectious plant illnesses.
As a result, one of the key components of a plant pathologist's education is diagnosis. Plant pathogens Illness control procedures can be a waste of time and resources and can result in additional plant losses if the disease and its cause are not correctly identified. Therefore, accurate illness diagnosis is essential.
the correct diagnosis of plant disease include the bellow steps.
Recognize the appearance of a healthy plant.Recognize the distinctive signs.Determine symptom variation.Search for indications of biotic causative agents.Determine Which Plant Part Is Affected - Are There Symptoms Related to Particular Plant PartsCheck the symptom distribution.learn more about pathogen here: https://brainly.com/question/1008643
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betweeen altitude versus average number of red blood cells which one is a dependent variable
Answer:
number of red blood cells
Explanation:
the number of red blood cells depend on what altitude you are at therefore its the dependant variable. altitudes is not dependant on anything so we say it's the independent variable
write E for Exponential Growth and L for Logistic Growth.
______26. This type of growth tends to level off upon the carrying capacity.
_____27. This type of growth has a period of steady growth.
_____28. This type of growth is more realistic and true
_____29. This type of growth keeps growing forever if unchecked
Only distinct populations of the same organism can experience the statement. The two growth strategies occur in various ways.
What is a growth in logistics?
When a population's rate of per capita growth declines as it approaches the carrying capacity, a limit set by finite resources, logistic growth occurs.
What are exponential growth and logistical growth?
There are two different types of population increase: exponential growth and logistic growth. The population grows at an exponential rate when there are plenty of resources available. When the restricted resources in the environment have an impact on the growing population, logistic growth results.
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A scientist is examining a single-celled organism that is often found in the human body; some examples of this
organism are helpful and some are harmful to humans. What kingdom does this organism belong to?
Protista
• Eubacteria
• Archaebacterio
O Animalia
Answer:
Eubacteria
Explanation:
Single called organism. Kingdom Prostista and Monera includes unicellular organisms. Hence Animalia is eliminated.
Single called organisms often found in human body is more directed to Kingdom Monera, as they are more in numbers inside our body[tex].[/tex]
Archaebacteria are primitive bacteria that are found mostly in extreme places. Hence Eubacteria wins! Eubacteria is the correct option.
Which of the following correctly gives the electric field at a distance R above an infinitely long line of charge with constant linear charge density λ?
Answer:
Correct option is B) Consider a Gaussian surface (cylinder in this case) of radius r and length l. Then according to the Gauss's Law of electrostatics:∫E.dA=ϵ0qenclosedFrom the symmetry of the surface, we can easily say that the electric field would only be along the radial direction. And the amount of charge enclosed by this cylinder is qenclosed=λ×l and the surface area of the cylinder A=2πrl. So, E×2πrl=ϵ0λl E=(2πϵ01)rλ
Explanation:
What is true about the structure or function of the plasma membrane?
1 .It attracts the water the cell needs.
2.It is made entirely of proteins.
3.It performs active and passive transport.
4.The double layer prevents anything from entering the cell.
Answer:
3
Explanation:
1 is wrong bc the cell membrane does not attract what the cell needs. 2 is wrong because it is made of more things than just proteins, and some helpful things enter the cell making 4 wrong.
