A Student's Experiment with Hermit Crabs

Which steps should the student include in his experiment to determine how hermit crabs choose which shell they inhabit based on color?

The correct step the student should include in his experiment is: A. He should add shells that are different colors, but the same size and type, to the tank and observe which shells the hermit crabs choose.

Understanding the Experiment

The Importance of Keeping Variables Constant: When conducting an experiment, it is crucial to keep all variables constant except for the one you are testing. In this case, the student wants to test if hermit crabs choose their shells based on color. By keeping the size and type of the shells the same, the student can accurately determine if the color of the shell influences the crab's choice.

Why Size and Type Matter:

Size: Hermit crabs choose shells that are just the right size for them to comfortably inhabit. If the student had included shells of different sizes in the experiment, the crabs might have chosen the larger shells simply because they provide more space, skewing the results. Type: Different shell types may have different textures or features that could also affect the crab's choice. By using the same type of shells in the experiment, the student eliminates any bias that may arise from differences in shell composition.

Conclusion:

By following the correct step of including shells that are different colors but the same size and type in the experiment, the student can accurately test his hypothesis and determine if hermit crabs choose their shells based on color. This method allows for a controlled environment where only one variable is changed, leading to reliable results. It's essential to design experiments carefully to ensure the validity of your findings.
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