A 17-year-old college-bound student receives a vaccine against an organism that causes meningitis. This is an example of a. secondary prevention. b. disease treatment. c. tertiary prevention. d. primary prevention.

The correct answer is option d. "primary prevention".

Explanation:

In health promotion, primary prevention are known as any activity or action that helps to prevent the development of an injury or a diseases before a person starts to suffer from it. Vaccination is a classic example of primary prevention. Other example of primary prevention is changing risky behaviors, such as having bad sleeping habits or eating junk food.

maritime tropical may be your answer.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!