Astudent is trying to match organ systems together according to their functions. which of the following organ systems are best paired in terms of their functions being opposite to one another?

a. immune and integumentary systems
b. nervous and endocrine systems
c. digestive and excretory systems
d. muscular and skeletal systems
e. circulatory and lymphatic systems

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