Final answer:
Natural disasters can strain emergency health services because many people are seriously injured at once.
Step-by-step explanation:
Natural disasters can put a strain on emergency health services because often many people are seriously injured at once. As human populations move into more vulnerable areas, we see an increase in the number of people affected by natural disasters, and we see that human interaction with the environment increases the impact of those disasters. For example, hurricanes, earthquakes, and tsunamis can cause widespread destruction and result in numerous injuries that require immediate medical attention, overwhelming emergency health services.