Answer:Scrub your hands for at least 20 seconds. Need a timer? Hum the “Happy Birthday” song from beginning to end twice. Rinse your hands well under clean, running water.
Explanation:
Answer:
Memory B cells...
1.a 2.c 3.d. 4.b 5.e 6.g 7.f 8.h 9.j 10.i
Cardiopulmonary resuscitation
