Ussel defenses induced by the presence of crabs? Hypothesis: Mussels increase investment in defense in the presence of crabs Null hypothesis: Mussels do not increase investment in defense in the presence of crabs Experimental setup: Seawater No crab Crab (fed fish, not mussels) Mussels Mussels Prediction: Mussels downstream of the crab tank will have thicker shells than mussels downstream of the empty tank. Prediction of null hypothesis: Mussels in the two tanks will have shells of equal thickness Results: 0.6 04- 02 00 No crab Crab What conclusion can you draw from the figure above? O Without direct contact, mussels can sense the presence of crabs. O Mussels can sense the presence of crabs only visually. O Mussels are increasing their shell thickness O Shell thickness is a non-inducible defense. O Crabs hunt for mussels by focusing on the chemicals they emit into the water. response to water current. Shell thickness Imm)

Ussel defenses induced by the presence of crabs? Hypothesis: Mussels increase investment in defense in the presence of crabs Null hypothesis: Mussels do not increase investment in defense in the presence of crabs Experimental setup: Seawater No crab Crab (fed fish, not mussels) Mussels Mussels Prediction: Mussels downstream of the crab tank will have thicker shells than mussels downstream of the empty tank. Prediction of null hypothesis: Mussels in the two tanks will have shells of equal thickness Results: 0.6 04- 02 00 No crab Crab What conclusion can you draw from the figure above? O Without direct contact, mussels can sense the presence of crabs. O Mussels can sense the presence of crabs only visually. O Mussels are increasing their shell thickness O Shell thickness is a non-inducible defense. O Crabs hunt for mussels by focusing on the chemicals they emit into the water. response to water current. Shell thickness Imm)

Biology: The Unity and Diversity of Life (MindTap Course List)

14th Edition

ISBN:9781305073951

Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Publisher:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr

Chapter25: Animal Evolution- The Chordates

Section: Chapter Questions

Problem 3DAA

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