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Campbell Biology | 10th Edition | ISBN: 9780321775658 | Authors: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
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MAKE CONNECTIONS Explain how the molluscan foot in gastropods and the excurrent siphon

Chapter 33, Problem 3

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QUESTION:

MAKE CONNECTIONS Explain how the molluscan foot in gastropods and the excurrent siphon in cephalopods represent examples of descent with modification (see Concept 22.2).

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QUESTION:

MAKE CONNECTIONS Explain how the molluscan foot in gastropods and the excurrent siphon in cephalopods represent examples of descent with modification (see Concept 22.2).

ANSWER:


The molluscan foot in gastropods and the excurrent siphon in cephalopods are examples of descent with modification because they both originated from the primitive mollusk form, which had a broad, muscular foot. Over time, the broad mollusk foot in gas

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