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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Food chain is a sequences of food eaten by various animals for their survival.
Biotic factors are those factors which are from biosphere and they are living.For examples=flora and fauna , human beings etc.
Abiotic factors are those factors which are not from biosphere and are non - living.For examples=metals and non-metals , stones etc.
Ecosystem is a place in which a living organisms lives.
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