Question

Why are plants so important?

Answer 1

It because they give us oxygen and without oxygen we would all die from oxygen deprivation.
the process that gives us oxygen is photosynthesis 
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Answer 2

Plants are important because they process sugar. Sugar is in most of the foods that we eat. They release oxygen and take in carbon dioxide. It's a trade between both of us, the human's breath and the plant, especially trees.