The 3rd one is the answer I think
Answer: They close to prevent blood from flowing back into the ventricles.
Explanation: To find the semilunar valve is the valve between the left ventricle and the aorta is the aortic semilunar valve.
Answer:solution 1 is more dilute
Explanation:
60g/1000ml = 0.06g/ml
60g/500ml = 0.12g/ml