Question

though these animals are mammals,make a distinction between platypus ,kangaroo and cat.

Answer 1

Platypus lays eggs. Kangaroo and cat gives birth to fertile young ones but kangaroo takes care of it babies for long time in its pouch but cats generally leave their babies after short time. Cats give birth to many kittens but kangaroo generally give birth to 1 or 2 babies.