Question number one for what?
Nerve cells may begin to pass messages more slowly than in the past. Waste products can collect in the brain tissue as nerve cells break down. This can cause abnormal changes in the brain called plaques and tangles to form.
Breakdown of nerves can affect your senses. You might have reduced or lost reflexes or sensation. This leads to problems with movement and safety
Answer:
C
Explanation:
B is a close one, but digestion means breaking it down into smaller pieces, and while the esophagus pushes, it doesn't make it smaller.
C, the stomach churning itself, allows for the acid to make the pieces smaller.
Drink plenty of water man