According to the big bang theory, how long ago did the universe begin? 5 to 10 billion years ago 13 to 15 billion years ago 23 to 25 billion years ago 30 to 40 billion year ago

answer; i believe that the correct answer is (b) melosis; plz check first.good luck

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.