First slide

Classification of Animals

Question

Which of the following aspects is first observed in annelids in the course of evolution?

Moderate

A

Triploblastic condition
B

Bilateral symmetry
C

Complete gut
D

True coelom

Solution

True coelom evolved first in annelids.
Triploblastic nature, bilateral symmetry are observed first in the phylum Platyhelminthes.
Complete gut first appeared in Aschelminthes.

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