What's the differentiating characteristic between an element and a compound

An element is a pure substance that can not be broken down any more and retain its properties. A compound is a substance that is made of multiple different substances.

a neutral ph of 7 and normal organism temperature is needed for a certain enzyme to be effective.  

what would happen to the enzyme if the ph and/or temperature fluctuate greatly from the norm?  

a.the enzyme’s hydrogen bonds will break.  

b.the activation energy will increase.  

c.more product will be formed.

d.the ideal temperature and ph for the enzyme function will decrease.  

the answer is: reproductively

i think i spelled it wrong lol

anyways hope i

-lavira: )