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motikmotik
1 year ago
12

Two students are planning an experiment that will test how planaria (aquatic flatworms) respond to different environments. They

will conduct two investigations—one that tests the worms’ responses to different water temperatures and one that tests the worms’ responses to different levels of acidity. Student 1 wants to buy two groups of flatworms and use a different group for each investigation. Student 2 thinks the same group of worms should be used for both investigations.
Biology
1 answer:
slamgirl [31]1 year ago
7 0

Student 2 is right.

<h3>Constant variables</h3>

In research investigations, some variables should be kept constant across various experimental groups in order for the outcome of the investigation to be valid.

For example, in order to test how flatworms respond to different environments, one variable that should be kept constant is the flatworms. The flatworms to be used must be of the same species, sex, age, etc.

The investigator can then go ahead to divide the flatworms into two or more groups and then subject them to different environments. Other variables should also be kept constant in order to determine the effects that are only specific to the different environments only.

More on constant variables can be found here: brainly.com/question/474060

#SPJ1

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Answer:

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For example, insulin hormone synthesized and released from beta cells of pancreas binds to its cell surface receptors present on the surfaces of liver cells and muscle cells to stimulate the uptake of the glucose from the blood.  

Likewise, neurotransmitters released from the presynaptic neuron bind to receptors present on the membrane of postsynaptic neuron and serve to carry the nerve impulse to the postsynaptic neuron.  

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2 years ago
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Answer:

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7 0
3 years ago
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2 years ago
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3 years ago
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