I think that C. 30 is the minimum recommended spf for sunblock.
Lymph vessels are more like valves than veins. They prevent back flow, so things only need to go in one direction, unlike other areas of heavy traffic. Let me know if you need more. :)
Answer:
Cardiovascular helps improve the heart, lungs, and blood flow. This is due to the exercises being ones that exercise mainly the heart and get the blood pumping.
Explanation:
