CER: Environmental Change and Snail Coloration
Use the graph below, which shows the color distribution in a snail population before and after an environmental change, to answer the CER (Claim, Evidence, Reasoning) question. Carefully observe the changes in the snail population and use scientific reasoning related to natural selection to support your answer.
Group 1
Answer the following CER question using the graph provided.
Source 1.1
Color Distribution in a Snail Population before and after Environmental Change
Question 1a
Make a claim about what environmental change occurred that could explain the shift in snail coloration. Use evidence from the graph to support your claim, and explain your reasoning by describing how natural selection could lead to this change in the snail population.
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