A food chain is the order in which we can see which predators eat which prey. Food chains are easier to understand at a glance then a food pyramid.
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The DNA molecule is a polymer of nucleotides. Each nucleotide is composed of a nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group.
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Please where's the image of the question
<span>The reaction required an input of energy.</span>
I think it’s the first one I might be wrong