Answer:
C
Explanation:
a difference in the pH of an environment changes enzymes activity
Answer:
One is that is releases toxic gasses.
I don't know another sorry.
Explanation:
Draw a single covalent bond between the 2 chlorine atoms, and place 3 lone electron pairs surrounding each of the chlorine atoms. This chemical bond is a Nonpolar one, as both chlorines have equal electronegativities.
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It would be the endocrine system.