Homeostasis is .
A
the process by which nutrients are absorbed in the villi of the small intestine

B
the tendency of the body to maintain inner balance despite changes in external conditions

C
the exchange of oxygen and carbon dioxide in the lungs

D
the filtering of blood in the kidneys that produces urine

B

the tendency of the body to maintain inner balance despite changes in external conditions

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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