Answer :

i. Human activities on the large scale such as clearing forest or cutting of trees on large scale (deforestation), burning of fossil fuels, more use of chemical fertilizers, and pesticides.

ii. These activities disturb the biogeochemical processes, directly or indirectly.

iii. Some steps should be taken to maintain the biogeochemical equilibrium in the ecosystem such as:

1. Plant more and more trees to maintain oxygen and carbon dioxide balance in nature.

2. Least use of chlorofluorocarbons.

3. Reduce vehicular pollution.

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