Answer:
The 3 functions are transport, protection, and regulation:)
<span>Get vaccinated.
<span>Avoid close contact
</span><span>Stay home if you are sick
</span><span>Cover your mouth
</span><span>Wash your hands
</span><span>Avoid touching your nose, eyes, and mouth
</span><span>Practice good health habits
</span><span>Clean and disinfect</span></span>
