Homeostasis refers to A.
the similarity of genetic traits to one another.
B.
a mixture or solution that is the same throughout.
C.
the tendency of a cell to maintain a stable internal environment.
D.
the effect of natural selection on human evolution.
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[C] The tendency of a cell to maintain a stable internal environment.

"Homeostasis refers to any process that living things use to actively maintain fairly stable conditions necessary for survival."

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.