Question

question 6 of 10
which factor has added to the average life expectancy?
a. clean water supplies
b. improved vaccinations
c. greater availability of health care
d. all of the above

Explanation:

Clean water reduces waterborne diseases, improved vaccinations prevent infectious illnesses, and greater healthcare access treats conditions—all contribute to longer average life expectancy. Thus, all options are correct.

Answer:

D. All of the above