Question

Choose the correct sentence.

* 1] Oxygen cycle can be operated in nature in the absence of green plants./

2] . Denitrification reduces the fertility of soil.

. 3 ]. Atmosphere is main source of nitrogen for plants.

4 ] The flow of nutrients through an ecosystem is non-cyclic. /
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Answer 1

Explanation:

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Answer 2

Answer:

sentence 3 is the correct option

Atmosphere is main source of nitrogen for plants

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