True coelom appeared for the first time in

True coelom appeared first in

A: True coelom originated for the first time in phylum annelida. R: It allowed the animal to have an alimentary canal longer than the body & space for storing gametes.

A: True coelom originated for the first time in phylum annelida. R: It allowed the animal to have an alimentary canal longer than the body & space for storing gametes.

In which animal group did the true nerve cells appear for the first time in the course of evlution?

Name the structures that appeared for the first time in amphibian, in the course of evolution.

Identify the phylum in which endocrine system appeared for the first time.

Organ system level of organisation appeared for the first time in the members of

Organ system level of organisation appeared for the first time in the members of