Question

how is cytoplasm useful for amoeba

Answer 1

contractile vacuole - a cavity within the amoeba that excretes excess water and waste; the waste is brought to the cell membrane and is then eliminated from the amoeba. cytoplasm - a jelly-like material that fills most of the cell; the organelles (like the nucleus) are surrounded by cytoplasm.

Answer 2

Cytoplasm in amoeba helps in it's movement which is known as cytoplasmic streaming