Individual, duplicated chromosomes line up in the middle of a cell during .

Metaphase. This is when the chromosomes line up in the center at the metaphase plate :) hope this helped!

The answer is c hope this

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