It is important to maintain septic systems in order to
a. prevent treated sewage from contaminating groundwater
b. process human waste into fertilizer
c. prevent untreated sewage from contaminating groundwater
d. none of the above

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products