Question

what is an ecosystem list two main components we do not clean natural Ponds or legs but an aquarium needs to be cleaned regularly why is it so explain

Answer 1

(a)an ecosystem is a self contained unit of living things and their non living environment
(b)components are biotic and a-biotic components
(c)pond is a complete ecosystem having decomposer organism which are the cleansing agents themselves. Aquarium  is a sort of incomplete ecosystem in the sense that it does not have decomposer organism for cleansing purposes