First slide

Classification of Animals

Question

During the course of evolution, a closed circulatory system first appeared in phylum

Easy

A

Arthropoda
B

Annelida
C

Platyhelminthes
D

Aschelminthes

Solution

A closed circulatory system is first appeared in phylum Annelida. Circulatory system is absent in Platyhelminthes and Aschelminthes. Arthropods have an open circulatory system.

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