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A. Without direct contact, mussels can sense the presence of crabs.
B. Mussels can sense the presence of crabs only visually.
C. Mussels are increasing their shell thickness in response to water current.
D. Crabs hunt for mussels by focusing on the chemicals they emit into the water.
Answer:A
Copyright © 2017 Pearson Education, Inc.
A. Without direct contact, mussels can sense the presence of crabs. B. Mussels can sense the presence of crabs only visually. C. Mussels are increasing their shell thickness in response to water current. D. Crabs hunt for mussels by focusing on the chemicals they emit into the water.