What must happen before a chemical reaction can begin? a. the activation energy must be exceeded b. the activation energy must be reached c. the concentrations of products and reactants must be equal d. the concentration of reactant molecules must be reduced

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a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

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