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

Closed circulatory system

Solution

A closed circulatory system 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.

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App