plankton
/ˈplæŋktən/
noun
- The small and microscopic organisms that drift or float in water (salt or fresh), forming an important part of the aquatic food chain.
- Whales eat huge amounts of plankton every day.
- Scientists study plankton to monitor the health of the ocean.
- Plankton is a key food source for many fish and marine animals.
Synonyms