Which substance plays a major role in most of the chemical reactions that occur in living cell

Water

Water is the substance that plays a major role in most of the chemical reactions that occur in living cell.

Water is a clear, tasteless, and odourless substance that is found in high amounts in living organisms, and is required by all forms of life. Water plays a major role in most of the chemical reactions that occur in living cells. Water is present both within and outside cells, and almost all chemical reactions take place in water solution. Water also acts as metabolite in many chemical reactions. It is either a reactant or a product of reaction. Water is involved in chemical processes such as digestion, photosynthesis, and aerobic respiration.

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you know they are heterozygous for a trait because they have it as jj or jj.