Which of the following characteristics of living things is very important for a group or organisms, but not a single organism? A: Living things respond to their environment.

B: Living things are made up of units called cells.

C: Living things maintain internal balance.

D: Living things reproduce

The basic repeating unit of nucleic acids are known as nucleotides. a nucleotide consists of three distinct chemical groups.

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