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(A)Food chain is a chain of food of animal and human being or it is a sequences.

(B) Biotic factors are those which are obtain from environment and are livings.For examples flora and fauna.

(C) Abiotic factors are those factors which are not obtAIN from environment and are non living.For examples=metals and non meTals etc

(D).Ecosystem is a place in which a organism live very comfortablily and easily acheives its requirements.
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1.Food chain-the series of processes by which food is consumed by any an organism is known as food chain.

2.Biotic factors-A biotic factor is any living component that affects another organism,that consume the organism in question,and the living food that the organism consumes.

3.Abiotic factors-abiotic factors are those non-living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.

4.Eco system-a biological community of interacting organisms and their physical environment

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