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Q.

The body is cylindrical and composed of _________ in hemichordata

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a

Trunk

b

Proboscis

c

Collar

d

All the above

answer is D.

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Detailed Solution

Phylum hemichordate consists of small group of worms like marine animals with an organ system level of organization. 

The body is cylindrical and is composed of an anterior proboscis a collar and a long trunk. 

The circulatory system is of open type.

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