Two morphologically similar populations are intersterile. They belong to

Two zoogeographical regions separated by high mountain ranges are

Assertion: Leaf butterfly and stick insect show mimicry to dodge their enemies.
Reason: Mimicry is a method to acquire body colour blending with the surroundings.

The Permian period,during which the first most modern orders of insects appeared,occurred approximately

........ is the largest land reptile.

The $Jurassic$ period of the $Mesozoic$ era is characterized by: