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

Which term best describes a community in which people work mostly in factories? a.agricultural. b.hunting and gathering. c.domesticated. industrial.

Which term describes a normal value for something in the body? a.homeostasis b.set point c.feedback loop d.integration center

Astudent wants to test the hypothesis that fertilizer improves the growth rate of grass seeds. to test this hypothesis, the student put the same amount of grass seed in 3 containers with the same type of soil. the student measured the growth at the end of the week. all plants received equal amounts of water and sunlight. if you were asked to graph this data, what would you place on the x-axis? a. fertilizer b. water c. plant growth d. week one