Question

write the charaters for the phylum nematode and echinodermat​

Answer 1

Answer:

They are widely distributed, aquatic or terrestrial, parasitic or free-living.

Their body is elongated, cylindrical, unsegmented, worm-like, bilaterally symmetrical and tapering at both ends.

They are triploblastic animals with perivisceral cavity more extensive than that of platyhelminths.

The body is of organ -system grade organization.

The body is generally covered with thick, flexible multi-layered collagenous cuticle and often bears cuticle setae (hairs), spines or annulations.

Cuticle moulted periodically.

They have cellular or syncytial epidermis I.e. the nuclei are not separated from each other by cell membranes.

Explanation:

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