why do we say that "an enzyme is reusable"?
a) the enzyme does not actively take part in the reaction. it just indicates that the reaction is complete.
b) enzymes react with the substrate molecules to form products and become denatured in the process.
c) enzymes ensure that the reaction continues without inhibition even if conditions such as temperature and ph are changed.
d) the products of the reaction are released from the active sites of the enzyme, allowing other substrate molecules to bind with the sites.

the answer is D  The products of the reaction are released from the active sites of the enzyme, allowing other substrate molecules to bind with the sites.

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.

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain