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

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d