Answer:
LD50 means a lethal dose of a particular substance or drug is given to a group of animals in a test group. This dose has the ability and capacity to kills 50% of the population of the test group of animals.
If Substance A has an LD50 of 20 mg/kg of body mass, this means that for 1 kg of body mass, 20 mg of substance A can kill 50% of the population that substance A was given to the test group.
If Substance B has an LD50 of 10 mg/kg of body mass, this means that for 1 kg of body mass, 10 mg of substance A can kill 50% of the population that substance B was given to the test group.
Therefore, Substance B is deadlier than Substance A because the quantity of substance B (10mg) is less than the quantity of Substance A (20mg) and it has the same lethal effect on the population.
Explanation:
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Answer:
B
Explanation:
Substance B is deadlier than Substance A because the quantity of substance B (10mg) is less than the quantity of Substance A (20mg) and it has the same lethal effect on the population.
An Emperor Penguin’s heart rate can slow significantly during a dive. This enables it to conserve oxygen underwater and spend more time finding food. This type of adaptation is known as:
A
Physiological adaptation
B
Habituation
C
Artificial selection
D
Behavioral adaptation
Grasses are the dominant producers in the prairie ecosystem. Mice eat the grass seeds, snakes eat the mice,
and hawks eat the snakes.
The mass of a hawk is around 500 grams.
In this ecosystem, how many hawks can be supported by 250,000 kilograms of producers?
Recall that 1 kilogram is equivalent to 1,000 grams.
Answer:
500,000 hawks
Explanation:
250,000kg=250,000,00grams
250,000,000/500=500,000hawks
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The stability of inheritance and variation between offspring from one generation to the next is explained by the field of
Genetics is the field of biology that deals with the study of what is transmitted in successive generations through genes.
What is genetics?It is the field of biology that studies how physical characteristics and traits are passed from one generation to another.
Therefore, it analyzes the stability and variation and how the inheritance of biology is transmitted from one individual to another, its main objective is to explain the way in which traits and various qualities are passed from parents to their descendants.
Therefore, we can conclude that genetics is the field of biology that deals with the study of what is transmitted in successive generations through genes.
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The process by which the order of bases in messenger RNA (mRNA codes for the order of amino acids in a protein is called a. nondisjunction b. replication c. translation d. Transcription
Answer:
The correct answer should be translation.
Hope this helps!!
2. Which features are associated with divergent boundaries?
a. folded mountains at ocean trenches
b. mountain chains at ocean ridges
c. non-boundary mountains
d. volcanic island arcs
Answer:
(b) mountain chains at ocean
I guess it is
brainliest if this helps you please
In ivan pavlov’s classic experiments, what type of stimulus was the bell?.
Answer:
because he was good
Explanation:god gave him powerful
What do smooth muscle cells look like under a microscope? A.small,striated,and 1-2 nuclei per cell. B.long and thin with striations and multiple nuclei. C.smooth ,1 nuclei,and connected by gap junctions.
Answer:
your answer would be C
C.smooth ,1 nuclei,and connected by gap junctions.
Explanation:
This is because, the other options include it having striations, and it does not have that.
Hope it helps :)
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Tori
Smooth muscle cells look like smooth, single nucleate, and connected by gap junctions under the microscope. Thus, the correct option is C.
What are Smooth muscle cells?
Smooth muscle cells are also called as involuntary muscle cells. These muscle shows no cross stripes under microscopic magnification. Muscle cells are made up of narrow spindle-shaped cells with a single, centrally located nucleus. Smooth muscle tissue, unlike the striated muscle, contracts slowly and automatically in the body.
At a cellular level, smooth muscle cells can be described as an involuntary, non-striated muscle cell. Smooth muscle cells consist of alternate thick and thin filaments which are not arranged into sarcomeres however it gives a non-striated pattern. On further microscopic examination, it appears homogenous.
Therefore, the correct option is C.
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The square of a number is 81 less than 18 times the number. Find the number
Answer:
The answer is 9
Explanation:
9~2=81
9<18>9
the square root of 9 is 81 and 9 is less than 18
Which of the following descriptions includes an extensive property?
A yellow in color, malleable, with a mass of 5 grams
B red in color, ductile, with a melting point of 1100°C
C colorless, odorless, with a freezing point of 0°C
D high luster, malleable, and ductile
Answer:
c
Explanation:
c is the correct answer to me
Yellow in color, malleable, with a mass of 5 grams descriptions include extensive property because extensive property depends on the quantity of matter.
therefore the correct answer is option A.
What is the matter?Anything which has mass and occupies space is known as matter, mainly there are four states of matter solid liquid gas, and plasma.
These different states of matter have different characteristics according to which they vary their volume and shape.
Extensive properties depend on the quantity of matter while the intensive properties do not depend on the quantity of the matter.
Yellow in color, malleable, with a mass of 5 grams descriptions include extensive property because extensive property depends on the quantity of matter.
therefore the correct answer is option A.
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What is the structural relationship between glucose and galactose?.
Answer:
They are both ald.open.toses.
Explanation:
how is an herbivore adapted to it's mode of feeding
PLS HELPPP :(((
VOLUME
Why does the first method for determining volume work only for a regular-shaped object?
Will the second method for determining volume work for any object or just an odd-shaped one?
Why?
Is one method of measurement more accurate than the other? Why or why not?
Would the displacement method of measurement work for a cube of sugar?
What about a cork? Why?
What did you find out from this investigation? Be thoughtful in your answer.
.
Answer:
1. Because only regular-shaped objects have a consistent length, width, height, and shape. When dealing with an object composed of differing shapes, you must calculate each portion separately and then add them. For instance, if you have a swimming pool of two depths and want to determine cubic feet, you would have to calculate the volume for each section and then add them.
2. method used to figure the volume of an irregular shaped object Neither measurement is more "accurate" than the other--they simply denote different things. Length is a measurement of the distance between two points in space. The area is a measurement of the surface covered by a given shape.
3. not in the water as the sugar would dissolve if you could find a liquid that sugar does not dissolve in, then it would work
Explanation:
Proper care for frostbite includes: OA Warming the frostbitten part under hot water OB. Warming the frostbitten part by massaging C. Warming the frostbitten part by heating with the radiant heater QD Warming the frostbitten part under lukewarm water
Answer:
D. Warming the frostbitten part under lukewarm water.
Explanation:
I just got this answer correct on the quiz
What can the process of mitosis do?
Check all
that apply
create human babies
develop new prokaryotic cells
help you grow taller and larger
cause one amoeba to become two
Answer:
The purposes of mitosis are :
cell renewal
repair of injuries
asaxual reproduction
growth of organisms
Explanation:
i hope this helped
Answer: Help you grow taller and larger
Cause one amoeba to become two
Explanation:
What can the process of mitosis do? Check all
that apply.
create human babies
develop new prokaryotic cells
help you grow taller and larger
cause one amoeba to become two
lichen are braindicator, why?
Answer:
Lichens can be found on rocks, trees, bare dirt, metal, and concrete, as well as in natural and man-made habitats. Because they get all of their nutrition from the air, they are sensitive to pollution, making them valuable as indicator species.
Explanation:
The process of making changes in the dna code of a living organism is called:.
Who studied layers of rocks and fossils and had their studies helped change the age of the earth from 6,000 to 3 million years old?
Answer:
James Hutton he did it
How is seawater intrusion a negative impact to the ecosystem?.
Answer:
Harm the availability or quality of source waters for drinking water utilities.
Explanation:
A portion of dna that encodes a specific protein is a.
Answer:
an RNA strand
Explanation:
The reason for this is that the question is asking for a portion of DNA that codes for proteins. RNA strands code for proteins, therefore the answer is an RNA strand.
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Where are the sugars created during photosynthesis?
Answer: Glucose is the basic sugar produced during photosynthesis in stroma part of chloropast.
Explanation:
It occurs in a series of steps, which together constitute Calvin cycle. Glucose, the basic sugar is thus produced in stroma part of chloroplast as explained above.
Energy in an ecosystem flows directly from _______. a. producers to tertiary consumers b. producers to secondary consumers c. tertiary consumers to secondary consumers d. secondary consumers to tertiary consumers please select the best answer from the choices provided a b c d
Answer:
A.
Explanation:
Primary producers use energy from the sun to produce their own food in the form of glucose, and then primary producers are eaten by primary consumers who are in turn eaten by secondary consumers, and so on, so that energy flows from one trophic level, or level of the food chain, to the next.
Energy in an ecosystem flows directly from producers to tertiary consumers. So, the correct option is A.
What do you mean by Ecosystem?An Ecosystem may be defined as an area where organisms of different species are present together in a given time and interact with one another in order to survive.
In an ecosystem, producers produce the energy in the presence of sunlight through the process of photosynthesis. And then passes its energy to primary consumers (herbivores), then primary consumer passes their energy to secondary consumers (carnivores), then secondary consumers pass their energy to tertiary consumers. According to Lindeman, only 10% of energy get transferred to each trophic level.
Therefore, Energy in an ecosystem flows directly from producers to tertiary consumers.
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What are the advantages and disadvantages of fungal medication
Please help me
Answer:
Advantage: altering a component in the cell walls, causing the contents of the fungal cells to flow out and the cells to perish. inhibiting fungal cells from multiplying and expanding.
Disadvantage: An allergic response may cause swelling of your face, neck, or tongue, as well as breathing difficulties. a severe skin reaction, such as blistering or peeling. Loss of appetite, vomiting, nausea, jaundice, dark urine or pale feces, weariness, or weakness are all symptoms of liver impairment.
Antifungal medicines are used to treat fungal infections, which most commonly affect your skin, hair and nails.
You can get some antifungal medicines from a pharmacy without needing a GP prescription.
Some fungal infections can grow inside the body and need to be treated in hospital.
Antifungal medicines work by either:
killing the fungus
preventing the fungus from growing
Before taking antifungal medicines, speak to a pharmacist or GP about:
any existing conditions or allergies that may affect your treatment for fungal infection
the possible side effects of antifungal medicines
whether the antifungal medicine may interact with other medicines you may already be taking
whether your antifungal medicine is suitable to take during pregnancy or while breastfeeding – many are not suitable
You can also check the patient information leaflet that comes with your antifungal medicine for more information.
LemonLex,
which parts of the flower are under more intensive selection for showiness (size, scent, color), the seed-producing part or the pollinator-producing parts
Answer:
The pollinator-producing parts.
Explanation:
Showiness, as described in the question, is based on size, scent, and color.
The pollinator-producing parts have certain scents, sizes, and colors to 'pop out' so they attract pollinators such as bees, so the flower can reproduce.
What are the genes that start cell division called?
The genes that start cell division are called Proto-oncogenes
Which factors affect the type of cloud that will be formed? select three choices. altitude temperature color of clouds size of ice pellets whether water condenses as liquid or ice
Answer:
To conclude, many factors affect cloud formation, including topography, air temperature, and humidity.
Explanation:
The factors affect the type of cloud that will be formed are temperature , color of clouds and water condenses as liquid or ice.
These factors affect the formation of clouds as cloud formation will have the all factors like humidity, water, temp, and also sometimes light.
What is altitude?It is the height of mountains or any plains, pleautue, and several other earth mountains, valley and sometimes also of the himalyan mountains.
Thus it is well explained.
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What morphology is represented in the picture?
O Spirilla
O Rod shaped
O Filamentous
O Cocci
A population of 1,000 squirrels live on a farm plot that has an area of 250 square feet. What is the population density?
Answer:
750 square feet
Explanation:
1,000-250=750
And this is the population density.
The population density is equal to 4 people/square feet.
What is the formula for calculating population density?The formula for population density is defined as the number of individuals divided by the area of land given.
Here, number of individuals = 1,000
Area of land = 250 square feet
So, 1000/250 = 4
Therefore, the population density is equal to 4 people/square feet.
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1. _______ behavior is inherited and programmed in the genetic code.
2. When a deer hears a sound in the forest, such as crackling footsteps, it immediately freezes and then bolts through the bushes. This is an example of the _______ response.
3. Mating rituals or displays can be very complex but are also _______ behaviors.
4. When animals fight and one wins and one submits, this allows for the establishment of a _______. This means that one animal (the winner) likely gets to reproduce and lead the group.
5. _______ behavior is used to intimidate other animals in social interactions. Examples include baring teeth or growling.
6. _______ behaviors rely on prior practice or experience.
7. When a dog is sleeping and does not react to the sound of a person walking around the house, that is most likely an example of ________.
8. A common type of learning that involves experimenting to get a reward is called _______.
9. _______ is the pattern of behavior that follows the day/night cycle.
10. Many bird species have seasonal behaviors that cause them to _______ or change their location.
11. Explain how territorial behavior helps an animal population survive.
Answer:
Innate
fight or flight
innate
hierarchy
Aggressive
Learned
habituation
trial and error
Circadian rhythm
migrate
When animals mark their territory they ensure that the mates and food in their area are not overwhelmed. Though territorial animals often fight, it is not to the death, and more to establish social order. This prevents them from over-eating their environment and helps the entire species stay in balance to survive.
Explanation:
2. If you break down each of the following, how many different atoms would you be able to recover? a) water
Hydrogen and oxygen atoms are produced when we break water molecule because it is made from these two atoms.
What we gain by breaking water molecules?When we break down water molecules, it splits into oxygen and hydrogen molecules. This can only be done throught the process of electrolysis. By passing an electric current, water can be converted into two atoms i.e. hydrogen and oxygen.
So we can conclude that hydrogen and oxygen atoms are produced when we break water molecule.
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Can you please help me thanks
Answer:
i know 4 is c) some offspring
Explanation:
