D- oesophagus
The stomach, small intestines,liver secret digestive juice.
Once they understood the structure of DNA a lot of things became more clear including how DNA was replicated.
So I think your answer is copies? meaning how it is copied (replicated).
The structure also led later on to how it was transcribed into mRNA (and eventually into proteins by ribosomes).
Answer:
I believe the awnsner is medicine. ((Not completely sure))
Explanation:
I think so because medicine is usually used to help defeat a sickness and not as much as repairing something that's wrong.
