Answer:
Weakening of digestive smooth muscle with age can cause constipation.
Explanation:
Smooth muscles in the digestive system have the role to move food down the tract via radially symmetrical contractions (peristalsis). With age, the function of smooth muscles reduces, causing the food to move more slowly through the alimentary canal (digestive tract). As a consequence, water gets absorbed from food waste, which can cause constipation.
Process by which body (somatic) cells are produced is called Mitosis
B, is the answer. I believe.
A portion of the electromagnetic spectrum is visible to the human eye, but I'm not sure what your options are.
