Question

How does prolonged space travel affect the muscular system?

A) Muscles become larger over time.

B) Muscles must work harder.

C) Muscles retain more minerals.

D) Muscles get weaker over time

Answer 1

its a

Step-by-step explanation:

i got it right

Answer 2

D) Muscles get weaker because of the lack of gravitational pull (which is what causes you to exercise your muscles more often on earth)