How are fossil organisms usually shown on an evolutionary tree?
A. as an endpoint on the right side of the diagram
B. as a common ancestor of organisms that are currently alive
C. as an "offshoot" from a line leading to an organism that is currently alive D. as a place where the lines going back from two organisms that are currently alive meet

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characterization of nanoparticles is a critical step in nanomaterial production as it provides information of dimension, morphology, surface charge, distribution and degree of surface functionalization.

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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.