Which of the following is NOT a characteristi | vedclass

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(D) The correct answer is $D$. $Cyclostomata$ are jawless vertebrates. Their heart is two-chambered (one atrium and one ventricle),not three-chambered

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Heart is three-chambered

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(D) The correct answer is $D$. $Cyclostomata$ are jawless vertebrates. Their heart is two-chambered (one atrium and one ventricle),not three-chambered. Other options such as a fibrous and cartilaginous endoskeleton,skin devoid of scales,and the presence of unicellular mucous glands are characteristic features of $Cyclostomata$.

Which of the following is $NOT$ a characteristic of $Cyclostomata$?

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