A Biologically Plausible Reason That Burrowing Earthworms Have Solid Segmental

question 18

Multiple Choice

A biologically plausible reason that burrowing earthworms have solid segmental walls but nonburrowing and parasitic annelids often have partial septa is

• A)the segmentation was selected to enable better expansion during burrowing.Parasitic annelids do not burrow and the loss of the ability to expand segments was not disadvantageous during their evolution.
• B)the nonburrowing worms were primitive and had not yet developed full walls.
• C)nonburrowing worms are halfway between roundworms and fully-segmented earthworms.
• D)that it permits fragmentation and regeneration of body parts,which earthworms need because they are in a dangerous environment,but internal parasites do not need this.
• E)None of the choices is correct.

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