In which of the following animals do sperm remain viable for a long period inside the female body?

Order Squamata consists of

Which one of the following is a true terrestrial animal?

$Typhlops$ is a:

$Assertion (S)$: In a chameleon,permanent teeth develop after the temporary milk teeth fall out.
$Reason (R)$: Chameleon is a uricotelic animal.

The exoskeleton of dry scales is a characteristic feature of ....