What are australopiths, how many groups are there, and what do they date to? Which one is derived and therefore not part of our direct evolutionary line?

I’d say a : water molecules

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