The brain and the spinal cord are the organs of the central nervous system.
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:
At 2 minutes the student's heart rates started to increase showing evidence of exercise.
Explanation:
Hope this helped! Please mark brainliest :)
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