Consider these observations made by a student watching an aquarium tank containing marine snails. a tank contained snails that were crawling all over the sides of the tank. when an opened mussel was introduced in the middle of the tank, the snails began to move quickly toward the food. based on these observations, frame two hypotheses that you can test.

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