What may have horses change over the last 40 million years? a) an increase in their height and weight b) the coming and going of several ice ages c) a change in their food, from trees to grass in the great plains d) being captured by indians and used for work, pulling wagons and riding

A change in their food, from trees to grass in the Great Plains.

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.  

answer; i believe the correct answer is (replication is not conservative);