Which of the following is NOT an example of responding to stimuli? A. Pulling your hand away from something hot. B. Maintaining internal pH levels. C. Stopping at a red light. D. Plants growing towards light.

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