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Question

Heternomous segmentation, i.e., the division of labour resulting in dissimilarity of the metameres of the different regions of the body, is found in the phyla

A
Cnidarians and Ctenophora
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B
Ciliophora and Sporozoa
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C
Protista and Porifera
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D
Annelida, Arhropoda and Chordata
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Solution

The correct option is D Annelida, Arhropoda and Chordata
Heteronomous annulation or segmentation is a type segmentation in which the segments are differentiated from one another and perform different functions. Some may be used for walking, some for feeding etc. For example, Annelida, Arthropoda and Chordata have heteronomous annulation. Thus, the correct answer is option D.

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