Which statement best describes a change that usually takes place in the human body when the heart rate increases as a result of exercise? O
A. More oxygen is delivered to muscle cells.
B. Blood cells are excreted at a faster rate.
C. The rate of digestion increases.
O
D. No hormones are produced.

Which animal group is the largest and contains more species from all the other living groups combined? is it mammals or

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

As scientist had investigated evolution from a variety fields they have found