Trygon (sting ray) possesses which of the fol | vedclass

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(D) $Trygon$ belongs to the class $Chondrichthyes$ (cartilaginous fishes).$1$. Like all fishes,they have a two-chambered heart consisting of one atriu

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All of the above

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(D) $Trygon$ belongs to the class $Chondrichthyes$ (cartilaginous fishes).$1$. Like all fishes,they have a two-chambered heart consisting of one atrium and one ventricle.$2$. In $Chondrichthyes$,the pelvic fins of males bear special copulatory organs called claspers.$3$. Their skin is tough and contains minute placoid scales.Since all these statements are correct,the correct option is $D$.

$Trygon$ (sting ray) possesses which of the following characteristics?

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