The process scientists use to answer a question or test an idea is called

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.