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A group of organisms with similar characteristics, which can interbreed and produce fertile offspring.
An organism that can synthesise its own organic molecules from simple inorganic substances (all plants)
An organism that lives on or in dead organic matter, secreting enzymes into it and absorbing the products of digestion (bacteria and fungi)
radially symmetric, tentacles, stinging cells, mouth but no anus. jellyfish, corals, sea anemones
Bilaterally symmetric, unsegmented, flat bodies, mouth but no anus. planaria, tapeworms, liverflukes.
Bilaterally symmetric, segmented, bristles often present, mouth and anus. earthworms, leeches, ragworms.
muscular foot and mantle, usually shell, segmentation not visible, mouth and anus. slugs, snails, clams, squids.
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