Question

the main, or central, idea of the passage is stanford students developed a baby warmer for use in the home, saving the lives of premature babies whose families lack access to incubators. how does the detail in bold develop the main idea? premature babies—born three or more weeks short of a full - term pregnancy—often lack vital body fat, putting them at risk of dangerously low body temperatures. such \preemies\ can be warmed in hospital incubators. however, incubators are not always a viable solution in lower - income countries. hospitals in poor countries often cannot afford the equipment, and the hospitals that do have incubators are typically located only in urban areas. many rural families are unable to transport their preemies such long distances, and those who make the trip can generally remain at the hospital for only a few days. a group of students at stanford university developed a solution: an inexpensive, portable baby warmer for home - based use. similar to a small sleeping bag, the warmer contains a heating pouch which, once warmed, maintains a temperature of 98.6°f for four hours. thanks to this innovation, thousands of preemies have been saved. it indicates why incubators arent a practical solution for all preemies. it explains why low body temperatures are harmful for preemies. it establishes the fact that premature babies may not survive.

Explanation:

The bold - faced text lists reasons like high cost, limited location of incubators, and transportation issues for rural families. These reasons show why incubators are not practical for all preemies, which supports the development of the alternative baby - warmer.

Answer:

It indicates why incubators aren't a practical solution for all preemies.