Animal: Multi-cellular ingestive heterotrophs (eat living organisms)
Plant: Multi-cellular photosynthetic autotrophic (make their own food) organism with a cellulose cell wall.
Fungi: Single celled or multi cellular heterotrophic organism with cell wall not made of cellulose, spread by spores in moist/dark/warm environment, saprotrophs (feed off dead organisms) or parasites
Prokaryotes: Single celled organism with no true nucleus