The answer to this is inherited mutation.
Inherited mutation is a permanent alteration in the DNA sequence that makes up a gene, such that the sequence differs from what is found in most people.
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You would need to gather more of the same data from a different group of students.
The plasma membrane is the cell structure you are looking for.
The answer would be: regression
Regression is a defense mechanism that causes the person fall into earlier psychological stages when an unpleasant stimulus received. The person chooses to turn back rather than facing the problem, which was seems safer and easier.
In this case, the 6-years old child starts to wet his bed, a sign that should be found in the baby(earlier stage).