• Plant-like protists are called algae (singular, alga).
  • They are a large and diverse group.
  • Some algae, the diatoms, are single-celled.
  • Others, such as seaweed, are multicellular.
  • Algae, like plants, obtain their energy through photosynthesis.
  • They are the main component of phytoplankton and contribute to the food base of most marine ecosystems.
  • Although not plants themselves, algae were probably the ancestors of plants.
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