What is the need of conserving bio-diversity?

Every species has a role to play in the ecosystem.
(i) we have selected our crop from a biodiverse environment.
(ii) we have got too many medicinal plant from this,
(iii) the animals we have as our livestock is also selected from the large variety of fauna,
(iv) Even insect help in pollination which we know is essential,
(v) how can we forget in the role of microorganism which sustains the flow of energy for our survival.

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