Which two reproductive barriers are at play in mule reproduction?

A mule is produced when male donkey (jack) mates with a female horse (mare).

Explanation:1.Horse have 32 pairs of chromosomes while a donkey has only 31pairs. Hence, their offspring inherit 32 horse chromosomes and 31 donkey chromosomes leaving a chromosome that is not paired up this makes them infertile and inability to produce embryo.

2. Horse and donkey chromosomes are not similar unlike in human hence mules and can rarely produce the cells critical for reproduction i.e eggs and sperm.

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.  

i'm sorry, but can you list the answers? i cannot with something i don't know the answers to

,

chris