Answer:
Secretion, in biology, production and release of a useful substance by a gland or cell; also, the substance produced. In addition to the enzymes and hormones that facilitate and regulate complex biochemical processes, body tissues also secrete a variety of substances that provide lubrication and moisture.
Explanation:
Answer:
C. Enzymes catalyze reactions in digestion
I don't know the fourth one but I do know that three of them are the heart, blood vessels, and the blood.
