I believe that it is because when you put the hand on ice it causes the hand too cool and prevents/slows the rate at which the nerves get damaged.
D. The data for the average heights of the plants in trials 1 and 3 contains errors
Explanation: Please double check my answer.
It is an answer of scientific questions and is based mostly on research
Do they? Yes, so they can see various results rather than relying one scientists work entirely.