According to nasa scientist bruce jakosky, the ability to utilize energy from some source to drive chemical reactions is one of the three important characteristics of life. in the students' experiment, what served as an energy source for the yeast?
a. water
b. sugar
c. oxygen
d. light

If ur wondering what the correct answer is (Like I was), it's B. Sugar. (If u want an awesome explanation, go over to the other question that shows up when u search this & check out the answer by @Kalahira )

Also, I just took the quiz so I can guarantee u guys thats the right answer.

I hope that helps u...Good Luck!

its probably to later but whats the question