Among the following which one is an example of acoelomate

Animals are classified into vertebrates and invertebrates based on the presence and absence of

__________ is called as the good indicators of environmental changes.

Who is the father of zoology?

Earth worm is an example of

Which is the highly poisonous fish in the world?

Among the following which one is a poikilothermic animal.

During the time of delivery, the mother experience severe labour pain, Name the hormone responsible for it?

Fishes live in fresh water and breed in the ocean, this migration is called as

Name one bird which can survive freezing cold temperature?