Select the odd one out:

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(B) The correct answer is $B$ (Trygon).$Exocoetus$ (flying fish),$Hippocampus$ (sea horse),and $Pterophyllum$ (angel fish) are all members of the clas

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Trygon

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(B) The correct answer is $B$ (Trygon).$Exocoetus$ (flying fish),$Hippocampus$ (sea horse),and $Pterophyllum$ (angel fish) are all members of the class $Osteichthyes$ (bony fishes).$Trygon$ (sting ray) belongs to the class $Chondrichthyes$ (cartilaginous fishes).Therefore,$Trygon$ is the odd one out as it has a cartilaginous endoskeleton,while the others have a bony endoskeleton.

$a$. Cellular level of organisation	$1$. Cnidarians
$b$. Organ level of organisation	$2$. Platyhelminthes
$c$. Organ system level of organisation	$3$. Chordates
$d$. Tissue level of organisation	$4$. Porifera

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Which of the following is a correctly matched pair?

Which of the following characteristics is $NOT$ shared by birds and mammals?

Match the following columns.
$a$. Cellular level of organisation $1$. Cnidarians
$b$. Organ level of organisation $2$. Platyhelminthes
$c$. Organ system level of organisation $3$. Chordates
$d$. Tissue level of organisation $4$. Porifera

Select the correct sequence for $a, b, c, d$.

Which pair represents a group of hermaphrodite animals?

Which of the following is $NOT$ true for $Phylum$ $Echinodermata$?

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