______are primitive relative of animals.

Assertion :- The protozoans are belived to be primitive relatives of animals. Reason :- Protozoans are heterotrophs and live as predators or parasites.

Which are believed to be primitive relative of animals?

What is true for all protozoans ? (A) are heterotrophs (B) they are either predators or parasites (C) hey are believed to be primitive relatives of animals (D) all of these

Sponges are primitive multicellular animals and have

_______ are the primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals.

Assertion :- Flagellates are free-living or parasitic or commensel in nature. Reason :- Members are most primitive among animals.

[A] : Sponges are primitive multicellular animals that probably evolved a multicellular structure independently of other animals . [R] : Sponges are stationary animals and remain fixed to substratum while water passes over them .