First slide

Classification of Animals

Question

Organisms which are devoid of tissues are included under the phylum

Easy

A

Porifera
B

Coelenterata
C

Annelida
D

Arthropoda

Solution

Sponges (phylum Porifera) exhibit cellular level of organisation. They lack tissues.
Coelenterata - Tissue level of organisation.
Annelida and Arthropoda - Organ system level of organisation.

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