Answer:
A
Explanation:
That shows you care about your community.
Answer:
Keep the object pointed away from yourself and other people at all times
Answer:
The “lub” is the first heart sound, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second sound,” dub” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.
