Renewable resources are 1) things that can provide heat but not other forms of energy 2) things that can be naturally replaced in a short period of time 3) things such as petroleum and coal 4) things that cannot be replenished

The answer is 2 because they are renewable which means replaceable

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