A patient is taking a beta-adrenergic antagonist medication for angina pectoris and asks the nurse how the drug works to relieve the discomfort associated with this condition. Which statement by the patient after the nurse’s teaching indicates understanding of the drug’s effects?a. "It causes bronchodilation, which increases oxygen flow."b. "It helps reduce the heart’s oxygen needs."c. "It improves blood flow to the heart."d. "It increases cardiac output."

c.) polymerase chain reaction

- "unlike the original dna fingerprinting method, dna profiling does not use restriction enzymes to cut the dna. instead it uses the polymerase chain reaction (pcr)? to produce many copies of specific str sequences. pcr is an automated procedure that generates lots of copies of a specific sequence of dna."

it's c. (to reduce the greenhouse effect/carbon gasses)

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.