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(B) In $Annelida$,$Nereis$ is an aquatic form which possesses lateral appendages called parapodia,which help in swimming. Thus,option $A$ is correct.I

Vedclass · Accepted Answer

Echinodermata $=$ Body is covered by chitinous exoskeleton

Vedclass · Answer

(B) In $Annelida$,$Nereis$ is an aquatic form which possesses lateral appendages called parapodia,which help in swimming. Thus,option $A$ is correct.In $Echinodermata$,the body is covered by an endoskeleton of calcareous ossicles,not a chitinous exoskeleton. Chitinous exoskeletons are characteristic of the phylum $Arthropoda$. Thus,option $B$ is the incorrect match.In $Aschelminthes$ (roundworms),sexual dimorphism is present where females are generally longer than males. Thus,option $C$ is correct.In $Amphibia$,the body is divisible into head and trunk,and many members have a tail. Thus,option $D$ is correct.

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