Question

space agencies around the world believe their future will include longer and more ambitious crewed missions. astronauts might even go to mars or to asteroids. this research is about astronauts. they can become as weak as 80-year-olds after six months at the international space station (iss). this finding raises serious health concerns about prolonged trips in space. biologist robert fitts based his conclusion on calf muscle biopsies that he collected from nine iss residents. he submitted to a biopsy before rocketing away to the iss.

question 5
this article would be most useful as a source for a student research project on
a. the relationship between strength and balance
b. the best ways to maintain a healthy weight
c. the role of plasma in preventing aging
d. the effects of space travel on human health

Explanation:

El artículo habla sobre cómo los astronautas pueden volverse tan débiles como octogenarios después de seis meses en la Estación Espacial Internacional (ISS), lo que plantea preocupaciones sobre la salud de los astronautas durante viajes espaciales prolongados. Esto está directamente relacionado con los efectos del viaje espacial en la salud humana.

Answer:

D. the effects of space travel on human health