Wilkins and Franklin studied the structure of DNA using , a technique to examine molecules, and helped Watson and Crick determined that the shape of the molecule was a
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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.

x would be the most and the least would be y because there are more fruit   and seeds than flock z has insects