Algae

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  • (archaeology) Photosynthetic, almost exclusively aquatic, nonvascular plants that range in size from simple unicellular forms to giant kelps several feet long. They have extremely varied life cycles and first appeared in the Precambrian.
  • (environment) Simple rootless plants that grow in sunlit waters in proportion to the amount of available nutrients. They can affect water quality adversely by lowering the dissolved oxygen in the water. They are food for fish and small aquatic animals. Source: Terms of the Environment


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