Question

which questions below could appear in a dichotomous key for fish? check all that apply.
does the specimen have spots on its body?
does the specimen have more than three gills?
does the specimen often eat shrimp instead of other fish?
does the specimen hunt alone or in a school?

Explanation:

A dichotomous key uses questions with two possible (yes/no or either/or) answers to identify organisms.

• "Does the specimen have spots on its body?" has a yes/no answer and is about a physical trait, suitable.
• "Does the specimen have more than three gills?" has a yes/no answer and is about a physical trait, suitable.
• "Does the specimen often eat shrimp instead of other fish?" is about diet, but diet can vary and is not a clear dichotomous physical/observable trait for identification (harder to observe directly from the specimen).
• "Does the specimen hunt alone or in a school?" has two distinct options (alone/school) and is an observable behavioral trait, suitable.

Answer:

• Does the specimen have spots on its body?
• Does the specimen have more than three gills?
• Does the specimen hunt alone or in a school?