Question

fish live longer in an aquarium with water plants in it than in one without them.why?

Answer 1

due to the presence of oxygen released through plants

Answer 2

this happens because of the oxygen content. when there are water plants in the aquarium they release oxygen so they can survive for more time. but when there are no plants in the aquarium the oxygen content is less there so the fish may have less life span.

hope so my answer is useful...........^_^   !!