Anyone know any good books to study exam style questions for 9th grade biology?

Explain why the plants cortex would serve as the best food source for animals

What terms describes being out of water after being submerged

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