APRIL 3 Scientists have many problems that they are working on but are unable to reach a useful solution. There are a number of

constraints that can make problems unable to have a solution. Match the current scientific problem and the major

constraint to finding a solution.

Available technology

Alternative energy resources

Cost and technology

Identifying life on other planets

Political and moral issues

Ocean desalination

Political issues and public interest

Using nuclear fusion as an energy source

Cost

Using stem cell technology to cure disease

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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