Students hypothesized that water pollution affects the growth of fish. in an experiment, they added the same amount of food to ponds polluted by fertilizers and industrial waste. they measured fish growth and found that most fish grow more slowly in each of these environments. what part of their experiment did they forget to include?

The correct answer will be control group.

Explanation:

A scientific experiment is designed in such a way that it should include two types of groups: the experimental group in which the variable has to be tested and the control group in which the variable to be tested is kept constant.

Since in the given question, the experiment was performed to test that water pollution affects the growth of fish, so the independent variable will be the "pollution".

The experiment was performed in which pond was polluted with fertilizers which will provide the experimental data but he forgot to prepare a control group which will provide the reference to the experimental data.

Thus, the control group is the correct answer.

a motor homunculus represents a map of brain areas dedicated to motor processing for different anatomical divisions of the body.

homunculus represents the importance of various parts of your body as seen by your brain. as a result, they take up a lot of brain space. although the cortical homunculus is a curiosity, penfield's work in mapping the brain's relationship to the body was invaluable.