Which of the following is not a difference between earth and other terrestrial worlds important for making earth habitable ? a. Earth has the most stable climate
b. earth is the only world with liquid water on the surface
c. earth is the only world with an atmospheric ozone layer
d. earth is the only world with plate tectonics
e. none of the above ( all are important differences)

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