Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
Sparrow
Lion
Goat
Frog
Major conduit of energy in land and aquatic ecosystem is transferred through ______ and ______ respectively.
Given food web contains some missing organisms $A, B, C$ and $D$. Identify these organisms and select the correct answer
Organisms living in open sea are called
Energy enters in ecosystem through
Primary producer of an ecosystem is