Organism - a single living plant, animal, virus, etc.:, Bacteria - types of very small organisms that lives in air, earth, water, plants, and animals, often one that causes disease:, Attribute - a quality or characteristic that someone or something has:, Vertebrates - having a spine (= back bone), Invertebrates - an animal with no spine:, Mammals - any animal of which the female feeds her young on milk from her own body. Most mammals give birth to live young, not eggs:, Reptiles - an animal that produces eggs and uses the heat of the sun to keep its blood warm, Amphibians - an animal, such as a frog, that lives both on land and in water but must produce its eggs in water,

Science video: Grouping living organisms

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