Plants and animals help in maintaining the balance of
A
Trees and animals
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B
Oxygen and carbon dioxide
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C
Green plants and plant eaters
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D
Water and minerals
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Solution
The correct option is B Oxygen and carbon dioxide The plants produce oxygen which is taken up by animals for respiration.
In return, the animals produce carbon dioxide which is taken up by the plants to produce food. Thus, this give and take relationship helps maintain the balance of oxygen and carbon dioxide.