Nail biting happens Because people have anxiety. The nail biting relieves stress, tension, and or boredom.
Hope this helps
~QueenSupreme aka Black-Rose♥
Answer:
What happens to the brain is the brain starts to adjust to the dopamine. And because of that the neurons will begin to make less dopamine. And less dopamine will signalise in the brain.
Aerobic<span> means "with oxygen," and </span>anaerobic<span> means "without oxygen." </span>Anaerobic exercise<span> is the type where you get out of breath in just a few moments, like when you lift weights for improving strength, when you sprint, or when you climb a long flight of stairs.</span>