• Protozoa generally feed by engulfing and digesting other organisms.
  • As consumers, they have various roles in food chains and webs.
  • They prey upon other single-celled organisms, such as bacteria.
  • Other protozoa are herbivores.
  • They graze on algae.
  • Still others are decomposers.
  • Protozoa are also important food sources for many larger organisms, including insects and worms.
  • They are heterotrophs and are capable of moving.
  • They can be classified on the basis of how they move.
  • Only sporozoa cannot move.
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