Many scientists are involved in research studying global climate change. Which limitation to climate research could most likely be overcome through scientific design? A. Conditions that create climate are extremely complex. B. Data from a wide range of time periods must be analyzed. C. Conducting experiments on a global scale is extremely expensive. D. Altering climates has ethical considerations because of the potential for harm.

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explanation:

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

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.