Living organisms can be grouped together by the features they share in common. Three main groups are:
Plants, Animals, Fungi

Plants.
Are: Multicellular, have chloroplasts, can photosynthesise, Have cellulose cell walls, store carbohydrates as sucrose or starch.
Herbaceous legumes like tomatoes

Animals.
Are: Multicellular, DON'T have chloroplasts, so DON'T photosynthesise. No cell wall around the membrane. Have a Nervous Control System to adapt to surrounding. Move around. Store carbohydrates as glycogen.

Fungi.
Some are single celled, others have a body called mycelium, made of Hypae (thread like structures), Hypae contain lots of nuclei. Cell walls are made of chitin.