Question

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Answer 1

Answer:

a)Free in the air and dissolved in water

b) Plants regulate oxygen levels in the atmosphere, which in turn prevents damage to the layer. Through photosynthesis, plants produce O2 and absorb CO2. Oxygen is essential for both animals and plants to perform vital process of aerobic respiration.

Explanation:

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Answer 2

Answer:

1. oxygen cycle, circulation of oxygen in various forms through nature. Free in the air and dissolved in water, oxygen is second only to nitrogen in abundance among uncombined elements in the atmosphere. Plants and animals use oxygen to respire and return it to the air and water as carbon dioxide (CO2).

2. Plants regulate oxygen levels in the atmosphere, which in turn prevents damage to the layer. Through photosynthesis, plants produce O2 and absorb CO2. Oxygen is essential for both animals and plants to perform vital process of aerobic respiration

Explanation:

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