Answer:
The ability of our bodies to adapt to different levels of gravity. You would become weaker and your heart is use to zero gravity. Boredom because there isn't much to in space. When intelligent people get bored, it's not pretty all the time...
Question 4 is true, question 5 is B.
Answer: Ecosystem
Explained: There's a minimum word count I'm filling up, don't mind me.
