Numerous people.... Diabetics who are experiencing nerve degeneration of the extremities (something called Diabetic Neuropathy). Another group would be the elderly, who do loose sensation as age progresses. And lastly those with some sort of paralysis or peripheral nerve damage.
Answer:
Diaspora
involuntary departure of a population from their homeland.
I believe the answer is (a) variability
The answer is “a superficial vein”
The area that Dylan needs to strengthen is A.) physical activity; add daily planned exercise to his schedule
