The two organisms from the above picture are anatomically similar but, they belong to two different phylum. Why?

Due to different type of coelom

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Due to presence of body segmentation

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Due to organ differentiation

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Due to difference in their habitat.

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Solution

The correct option is C Due to organ differentiation
$∙$ Earthworm is an annelid while roundworm is a nematode. They are anatomically similar.
$∙$ Annelids and nematodes are bilaterally symmetrical.
$∙$ Annelids are the first organisms to show a true body cavity (coelom) whereas Nematodes have false coelom (pseudocoelom).
Annelids are different from nematodes as they have a segmented body with extensive organ differentiation. Thus, annelids are little more complex in body organisation than nematodes.

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