First slide

Classification of Animals

Question

During the course of evolution, which of the following appeared first in Annelida?

Moderate

A

Jointed appendages
B

Organ-system level of organisation
C

Triploblastic organisation
D

True coelom

Solution

A true coelom first appeared in phylum Annelida.
Jointed appendages first appeared in Arthropoda.
Triploblastic organisation first appeared in Platyhelminthes.
Organ systems are present in lower phyla like Aschelminthes also.

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