How does an artificial pacemaker work?
A pacemaker helps monitor and control your heartbeat. The electrodes detect your heart's electrical activity and send data through the wires to the computer in the generator. If your heart rhythm is abnormal, the computer will direct the generator to send electrical pulses to your heart.
Pre-Test
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Chan Hee is inflating a basketball using an air pump. He notices that the pump gets warm as he uses it. What is a good
hypothesis that could lead to new experimentation?
If there is no air in a basketball, then it is hard to play the game.
A basketball that is inflated bounces better than one that is not inflated.
If air in a pump is squeezed more, then the air gets hotter because energy is added to it.
Basketball is more fun to play than baseball because you have to move a lot more.
Answer:
If air in a pump is squeezed more, then the air gets hotter because energy is added to it.
Explanation:
A good hypothesis in the given case is that inflating basketball is getting warmer, the more it is pumped, and as a result, it would possess more heat or more friction due to all the air being pumped into the basketball at a single time.
hope this helped!
Look at the chemical reaction below
Magnesium + hydrochloride acid —> magnesium chloride + hydrogen
Mg + 2HCI —> MgCI2 + H2
In this reaction
Magnesium (Mg) is a reactant or product
Hydrogen (H2) is a reactant or product
Magnesium chloride (MhCI2) is a reactant or product
Hydrochloride acid (HCI) is a reactant or product
Answer:
Mg is a reactant ,H2 is a product, MgCl2 is a product and HCl is a reactant.
Definition: In ecosystems, this is the breakdown of organic matter to its basic chemical components.
Answer:
Decomposition :)
Explanation:
Answer:
It is decomposition
Explanation:
How does the water needed to carry out photosynthesis get to leaves?
Answer:
The xylem
Explanation:
The xylem in the stem transports water and minerals from the ground up the plants, and into cells in the leaves so that photosynthesis can be carried out.
Question 3 of 10
2 Points
When can exponential growth happen?
O A. When there is unlimited food and space
B. When the death rate is high
C. When carrying capacity is reached
D. When there is competition for resources
Answer: when there is Unlimited food and space
Explanation:
When there is unlimited food and space. Exponential growth occurs when a population has unlimited resources, such as food and space, and there are no limiting factors such as predation, disease, or competition for resources. In such a scenario, the population will continue to grow at an accelerating rate without reaching a carrying capacity. Hence option A is correct.
What is exponential growth?
Exponential growth can occur when there are no limiting factors that affect the population size. This means that the population has access to unlimited resources such as food, water, and space. In this scenario, the birth rate exceeds the death rate, and the population grows at an increasing rate over time.
As the population grows larger, the rate of growth also increases, resulting in a J-shaped curve on a graph.
However, in the real world, exponential growth is limited by factors such as predation, disease, competition for resources, and environmental factors like weather and natural disasters.
When these limiting factors are present, the growth rate of the population slows down, and the population may eventually reach a maximum size that the environment can support, known as the carrying capacity.
At this point, the population growth rate slows down to zero, and the population size stabilizes at or around the carrying capacity.
Hence option A is correct.
To know more about exponential growth:
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Use the drop-down menus below to identify the organ(s) that is/are responsible for each function of the
excretory system.
releases excess heat from body
reabsorb water to maintain normal composition and volume of blood
and fluids and prevent dehydration
excrete wastes that balance salt
Explanation:
releases excess heat from the body, which would be sweat glands, excretory system/
reabsorb h2o 2 maintain norm. composition, volume of blood=kidneys.
Answer:
1.skin
2.kidneys and large intestine
3.skin, large intestine, and kidneys
Explanation: got it right
What are these panels used for?
O A. To produce a fission reaction
B. To create electricity from solar energy
O C. To transform energy from moving water
O D. To convert electricity into less usable energy
Answer: b
Explanation: I believe these are solar panels
A goal of using animal models is to explain the molecular detail of specific behaviors encoded in the human brain. How would you compare the developmental biology experiments on memory and learning using the fruit fly, drosophila melanogaster, as evidence about the evolution of a human behavior?
Answer:
It is possible to compare the expression of homologous genes in the brain of D. melanoganster and humans, because the expression levels of conserved genes may be associated with the evolution of cognitive features such as complex learning and memory.
Explanation:
Model organisms can be used to understand the patterns and processes that affect human evolution. Drosophila melanogaster is a model organism that has been used to study expression patterns of conserved genes in the course of evolution. This model organism has also been used to develop genetic mutant lines in order to examine the role of genes evolutionarily conserved in animals, including those involved in neurocognitive development.
In genetic research, an experiment as the above described is framed in a research field named 'Behavioral Genetics', which is a discipline that studies how evolutionarily conserved gene networks may be associated with neurocognitive tasks during brain evolution.
Which statement best describes the kinds of questions science can answer ?
Answer:
option A
Science can answer only questions about the natural world
Explanation:
Science is a discipline which on the basis of implementation of experimentation procedure that can mimic the experimental setup resembling that of natural world. Therefore, is capable of answer questions about the natural phenomenas occurring in the natural world.
Answer:
option A.
Explanation:
That's because Science mainly deals with the study of the structure and behaviour of the physical and natural world through observation and experiments.
Please help
this is urgent
Answer:
if I knew what this was I honestly would help you
what does the m stand for in interphase
Answer:
I believe the answer is mitosis
Explanation:
Hope this helps.
FALLING OF STONE
○ FAST CHANGE
○NATURAL DESIRABLE CHANGE
○NATURAL UNDESIRABLE CHANGE
○SLOW CHANGE
Answer:
answer is fast change due to free fall of object in air.
What are the inputs and outputs of cellular respiration and photosynthesis?
energy
water
oxygen
sugar
carbon
dioxide
Photosynthesis
Cellular Respiration
Inputs
Outputs
Photosynthesis
inputs : water , carbondioxide,
outputs: oxygen, sugar
Cellular respiration
inputs : sugar, oxygen
outputs: water, carbon dioxide
The sun is located at one of the two___ in the shape of earth’s orbital path.
Answer:
foci
Explanation:
DNA carries the instructions to make _____.
Answer:
They make new sells in your body.
Answer:
Proteins
Explanation:
DNA carries the instructions to make PROTEINS.
Which two types of clouds extend vertically through the troposphere?
The heliocentric system gained support when Galileo observed that
Answer:
Venus goes through phases similar to those of Earth's moon. Hope this helps out.
Explanation:
(1) What will be the frequency of the recessive allele in a population of 100 kangaroos if there are 50 dominant alleles?
a. 150
b. 0.75
c. 0.50
d. 0.25
(2) If the frequency of the recessive allele for a gene is 0.3, calculate the expected frequency of heterozygotes in the next generation if the population is in Hardy-Weinberg equilibrium.
a. 0.42
b. 0.21
c. 0.70
d. 0.30
Answer:
1. Option c
2. Option a
Explanation:
1. If there are 50 dominant alleles, this represent the frequency of dominant alleles p = 50/100 = 0.5
Using the formula p+q = 1 we can solve for the frequency of the recessive alleles q = 1 -0.5 = 0.5 = 50%.
2. the frequency of the recessive allele for a gene is 0.3 which is q = 0.3
From the Formula p + q = 1 we can solve for p the frequency of the dominant alleles = 1 - 0.3 = 0.7
To calculate for the number of heterozygotes, we use 2pq = 2 x 0.7 x 0.3 = 0.42
Regulating the manufacture of
is the function of RNA.
protein
cells
energy
Answer:
The correct answer is option A, that is, proteins. RNA functions to transform the directions found in messenger RNA into the chain of amino acids, which forms the proteins. Thus, the ribosome is accountable for the production of proteins.
HOPE IT HELPS : D
Explanation:
carbon dioxide + water =
how is silk extracted from cocoons?
______________ surround each stoma and control its size.
A. Spongy Layer
B. Guard Cells
C. Palisade Layer
Answer:
The answer is B.
Explanation:
Guard cells is nearest to stomata which surround each stomata and control the size of stomata.
In the text area below describe the function of the
cell wall.
DONE
Answer:
The cell wall supports and protects the cell, determines the shape of the cell, assists cells in communication, stores carbohydrates, and allows water and smaller particles to enter the selectively permeable structure of the cell.
extinction occurs when the environment changes and
Answer:
a population dies out
Explanation:
when the environment changes causes the animals or living specimens to die out
A plant cell is placed in a freshwater solution. When it swells with water, filling it's vacuole,
we say that it has
A)crenated
B)plasmolyzed
C)lysed
D)become turgid
Answer:
D. The plant becomes turgid
Explanation:
Which component of a DNA synthesis reaction determines the exact nucleotide sequence of the product?
Answer:
The complementary base pairing between incoming nucleotides and the DNA template
Explanation:
In a DNA synthesis reaction, the exact nucleotide sequence of the product is basically determined by both the DNA template from which a new strand is made and the incoming new nucleotides that makes up the new DNA strands. A complementary base Paris between these two gives the nucleotide sequence of the product.
Which type of nonvascular plant grows in new or disturbed environments?
A. mosses
B. ferns
C. hornworts
Answer:
A.mosses
Option A is the right answer
Which one of these contains an atom of phosphorus?
Nitrogenous base Pentose Sugar Phosphate Group
Which component of a DNA synthesis reaction is an enzyme?
Answer:
DNA polymerase
The enzyme that synthesizes DNA, DNA polymerase, can only add nucleotides to an already existing strand or primer of DNA or RNA that is base paired with the template. An enzyme, DNA polymerase, is required for the covalent joining of the incoming nucleotide to the primer.
Explanation:
hope it helps!
