The roundworm, Ascaris, can be called as specialized and not degenerate (with reference to parasitism) because

It is dioecious.

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Respiratory organs absent.

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It has an uncoiled alimentary canal.

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Cuticle over the body wall is resistant to the host's digestive juices.

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Solution

The correct option is D Cuticle over the body wall is resistant to the host's digestive juices.
The round worm (Ascaris) may be regarded as specialized animal and not a degenerated one because of the fact that, it has cuticle over the body wall which is resistant to host's digestive juices which is a parasitic adaptation.
Therefore, the correct answer is option D.

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Similar questions

Why is the inner wall of alimentary canal not digested although the digestive enzyme can digest all the materials that make cells?

	Column I	Column II
A	Millipede	A terrestrial organism with two pairs of jointed appendages attached to each of its many body segments and respires through trachea.
B	Nerels	Numerous setae on leteral appendage called parapodia.
c	Taenia sollum	Body is covered with cuticle, alimentary canal absent.
d	Ctenophores	Radially symmetrical, devoid of cnidoblasts, polpy stage present in their life cycle.

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