Figure 53.4
-What conclusion can you draw from Figure 53.4?
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)Shell thickness is a non-inducible defense.
E)Crabs hunt for mussels by focusing on the chemicals they emit into the water.

Question

Figure 53.4 
-What conclusion can you draw from Figure 53.4?
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)Shell thickness is a non-inducible defense. 
E)Crabs hunt for mussels by focusing on the chemicals they emit into the water.

Quizplus · Accepted Answer

Figure 53.4 shows that mussels increased their shell thickness in response to the presence of crabs in the water. Since the crabs were not in direct contact with the mussels, this suggests that the mussels can sense the presence of the crabs without direct contact, supporting option A. Option B is incorrect because the figure does not provide evidence that mussels rely solely on visual cues to sense the crabs. Option C is also incorrect because the figure does not provide evidence that water current is related to the mussels' defense response. Option D is not supported by the figure, which shows that shell thickness increased in response to crabs, indicating an inducible defense response. Option E is not relevant to the information provided in the figure.

Figure 53.4 -What Conclusion Can You Draw from Figure 53.4