Which statement describes two organ systems working together to deliver nutrients to cells?
A. The blood absorbs the nutrients that the digestive system obtains
from food.
B. The molecules of important nutrients are made from food in the
digestive system.
C. The respiratory system transfers oxygen removed from nutrients
to the blood.
D. The excretory system removes excess nutrients from blood as it
makes urine.

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