The correct answer is: D. Enzymes
Enzymes are biological catalysts, which means they speed up the rate of chemical reactions without being consumed by the reaction. They are essential for life, as they are responsible for catalyzing the vast majority of chemical reactions that take place in cells.
Hormones are chemical messengers that are produced by glands and transported in the blood to target cells, where they regulate physiological processes. Vitamins are essential nutrients that are required for normal growth and development. Steroids are a group of lipids that are produced by the body and have a variety of functions, including regulating metabolism, reproduction, and immune function.
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