Classify the following animals into their respective groups: Snail, amoeba, hydra, earthworm, starfish, sea anemone, cockroach, roundworm, spider, sponge, butterfly, bat, whale, crocodile, frog, crow, cow, shark, prawn, butterfly.

Differentiate following on the basis of characters asked in the subparts : (a) Human/Bird (number of condyles) (b) Whale and shark (number of respiratory apparatus and position) (c) Sea anemone/Ctenophora (symmetry) (d) Crocodile/Toad (number of characters of heart) (e) Moth/Butterfly (wings in sitting position).