clam bam

clam bam - Biology 101 Lab Section 420 6 November 2006...

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Biology 101 Lab Section 420 6 November 2006 Natural Selection and Adaptation Essay All mollusks have mantles that enclose their soft bodies. In clams, (along with other shelled mollusks,) the mantle is responsible for secreting the shell. The mantle in clams is particularly large, covering the clam’s head. The clam’s shell is very thick and hard with pronounced ridges. This type of shell was perhaps an adaptation from the clam’s hypothetical ancestor that better allowed the clam to withstand the shock and force of ocean currents and waves. Natural selection could have favored those clams with thicker shells, thus the possible mutation that the shell came from became common among clams. Clams use their foot for burrowing. This adaptation could have been favored by natural selection because it allowed for the calms to hide from their predators; those clams that were better equipped to burrow were the ones who better survived and had the chance to reproduce. Bivalvia have no radula.
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This note was uploaded on 03/26/2008 for the course BIOL 101L taught by Professor Stengaga during the Fall '08 term at UNC.

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clam bam - Biology 101 Lab Section 420 6 November 2006...

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