4th one should be the correct answer if I am not mistaken
D. The last choice , you need to hear the traffic
It would be how organisms respond to stress over time.
Ive read that the -The “ lub<span>” is the first </span>heart sound<span>, commonly termed S1, and is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second </span>sound<span>,” </span>dub<span>” or S2, is caused by the closure of aortic and pulmonic valves, marking the end of systole.</span>
That is the major calyx, hope I helped :)
