The nucleus is surrounded by a semipermeable membrane. What would happen if this layer were permeable to most substances? A. The DNA in the nucleus would be protected from harmful substances

B. Enzymes would not be able to speed up reactions in the nucleus.

C. The nucleus would not be able to communicate with the rest of the cell.

D. Large molecules would be able to enter and damage the nucleus.​

D

Explanation:

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.