Alexis knows that different forms of water can affect erosion differently. She wants to build a model to compare different forms of water. How could she build a model to compare how different forms of water cause erosion on a hill?

1. Obtain two identical containers and dry sand.

2. Shape equal amounts of sand into a
(A) slope on the side of each container
(B) flat layer in each container

3. Spray water on the sand in one container. The sprayed water represents
(A) a flowing river
(B) ocean waves
(C) rainfall

4. In the other container,
(A) do not add water. this represents the lack of water erosion
(B) place ice cubes to melt on the sand. this represents snow or glaciers

Analyze differences between the two containers.

1. Obtain two identical containers and dry sand.

2. Shape equal amounts of sand into a  "slope on the side of"  each container.

3. Spray water on the sand in one container. The sprayed water represents "rainfall" .

4. In the other container,  "place ice cubes to melt on the sand. This represents snow or glaciers." .

5. Observe and record the changes in the sand.

6. Analyze differences between the two containers.

Explanation:

Mine hasn't been graded yet but I'm pretty sure this is the right answer. I'll come back once it's graded and say.

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the correct answer is:

a population changes in response to a change in the environment.