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A. 3

Explanation:

There is half as many moles of CO₂ as of O₂. Half of 6 is 3. The equation is:

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary