Which sentence from the section "Vaccines Are Made From Weak Or Dead Germs" BEST introduces booster shots to the reader?

The germs that cause infections are mainly spread in what three ways? a. immunization, mucous membranes, not washing hands b. germ-laden droplets, direct contact with body fluids, insects c. hand hygiene, sickness, immunization d. not enough sleep, low oral hygiene, germs

Which stage of stress includes the fight or flight response?

Explain the sliding filament method