Help me with this please I’ll award brainliest
make sure to explain why that’s the awnser. :)

according to health left ventricle semi lunar valve pulmonary artery and lungs are the part of circulatory system

which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.