Answer:
biology is the study of living things
It's D. Stretching opens up arteries. This makes blood more able to get through and lowers blood pressure. Stretching makes your muscles ready for an exercise. Improved circulation is just like lowering blood pressure because it opens up arteries, veins, and capillaries. D is wrong because stretching doesn't make your heart stronger. I hope this helps! :)
The answer is adenitis. Good luck bud!!
1 what are the three structures of the cardiovascular system
