1. a material consists of an element. how many types of atomic structures are present in this substance? a no atomic structures are present as this is a pure substance. b one type of atomic structure is present as this is a pure substance. c two types of atomic structures are present in this substance. d several types of atomic structures are present in this substance.

c

explanation:

i think

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.

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