Imagine that we mate two black labrador dogs with normal vision and find that three of the puppies are like the parents, but one puppy is chocolate with normal vision and another is black with pra (progressive retinal atrophy, a serious disease of vision). we can conclude that:

The answer to this will be from your lab notes/procedure. it would be best to ask another student who participated in the lab as we do not know what was done, what enzyme or if the temperature is celsius or fahrenheit. if i were to guess though i'd say the rate stopped due to enzyme denturing at high temperature

Mitosis is one and the other is metoisis 

The answer is calcium