Fill in the gaps :-
A) The entry point of energy is an ecosystem is ____
B) In a food chain the number of trophic levels are seldom more than four and five, because at each level some of the _____ is lost, and ultimately very little of it is left for the last, fourth or fifth level.
C) _____ is an example of organisms that occupies more than one trophic level.
D) ______ is a group of living beings together with their environmental factors with which they interact.
E) A food web tells us about the _____ relations, and the flow of ____ in an ecosystem.
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