Match the following list of animals with their level of organisation.

Division of Labour Animal

A. Organ level                      i. Pheritima

B. Cellular agregate level        ii. Fasciola

C. Tissue level                      iii. Spongilla

D. Organ system level            iv. Obelia

Choose the correct match showing division of labour with animal example.

• i-B, ii-C, iii-D, and iv-A

• i-B, ii-D, iii-C, and iv-A

• i-D, ii-A, iii-B, and iv-C

• i-A, ii-D, iii-C, and iv-B

How useful is the study of the nature of body cavity and coelom in the classification of animals?

Distinguish between intracellular and extracellular digestion? 

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Water vascular system is the characteristic of which group of the following: 

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