Answer the following question given this paragraph: 

Nekton are living things that swim through the water. They may live at any depth, in the photic or aphotic zone. Most nekton are fish, although some are mammals. Fish have fins and streamlined bodies to help them swim. Fish also have gills to take oxygen from the water. Figure below shows examples of nekton.


Q: What are the two classifications for organisms living in water?


A:
nekton and plankton