Answer:
Vaccines create immunity without causing illness or resulting complications. Herd immunity makes it possible to protect the population from a disease, including those who can't be vaccinated, such as newborns or those who have compromised immune systems.
Explanation:
The answer that you are looking for is A. Nephrons
Answer:
D) airway obstruction
Explanation:
Referring to the "Types of Disasters" page published by the Red Cross online (www.redcross.org/get-help/how-to-prepare-for-emergencies/types-of-emergencies.html), there are guides for disasters involving flooding, hurricanes, and earthquakes. However, there are no guides for an airway obstruction.