Answer:
When you heat proteins in water that is 100°C they denatures and the enzymes change shape.
Explanation:
I went to a school that asked these types of questions once and made me memorize the answers (:
A, because of evolution things are constantly changing. DNA is written with letters and we are nearly identical but yet a few chromosomes make up our differences, but everyone has the possibility of a bad bacterial causing a DNA change which completely changes our reading
It contributes because they help us breathe.
By preforming an experiment