Any (single) living organism that consists of more than a single cell.
yes
Yes, plankton is a microorganism.
Check your spelling. Perhaps you mean "organism" or "orgasm".
homeostasis or the ability for an organism to adapt or react and survive in its environment
It is multicellular
Platypuses are multicellular. All mammals, and indeed all vertebrates, are multicellular.
cnidarians are multicellular
A grizzly bear is a multicellular organism.
Yes, Hydra is Multicellular.
Bread mould is multicellular.
Cows are Multicellular organisms. Hope you Like it!.
Monkeys are multicellular organisms.