50 POINTS Select the word or phrase that correctly completes the statements.
refers to the breakdown of food by enzymatic action. During , the teeth break down food into smaller pieces. During , enzymes break down food into molecules.
The options for the first one are metabolism, digestion, absorption, and excretion. The options for the second one are absorption, chemical digestion, physical digestion, and metabolism. The options for the last one are absorption, chemical digestion, physical digestion, and metabolism.

Transplant operations have become routine. one common transplant operation is for kidneys. the most dangerous aspect of the procedure is the possibility that the body may reject the new organ. there are several new drugs available for such circumstances and the earlier the drug is administered, the higher the probability of averting rejection. the new england journal of medicine recently reported the development of a new urine test to detect early warning signs that the body is rejecting a transplanted kidney. however, like most other tests, the new test is not perfect. in fact, 20% of negative tests and 10% of positive tests prove to be incorrect. physicians know that in about 33% of kidney transplants the body tries to reject the organ. if the new test has a positive result (indicating early warning of rejection), what is the probability that the body is attempting to reject the kidney?