vegetables grown on the ISS help nourish the astronauts fill in the blanks to explain another reason for growing gardens on the ISS

You did not include the options for the blank spaces so I can only answer as best as I can based on the passage.

Scientists are experimenting how to best grow foods in space. Growing vegetables in space would help astronauts travel to Mars since the distance to Mars would make restocking an in-flight spacecraft impossible.

Explanation:

1-Hope to learn

2-Travel to

3-Great distance to

a,b,d are the three sentences that use a reflexive pronoun