Environmental Science
What is meant by ex-situ conservation?

Conservation of forest eco system
Conservation of plants
Conservation of a species by protecting its habitat along with all other species living there
Conservation of a species outside its natural habitat

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Environmental Science
Biogas is composed of

ethane, carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and hydrogen
carbon dioxide, nitrogen and hydrogen
methane, carbon dioxide, nitrogen and sulphur

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