During science class, a group of students went on a field trip to a nearby pond where they collected samples of pond water and pond plants. the students used a microscope to study cells in their samples. they also took samples of their own cheek cells and studied them using the microscope. the results are shown in the following table

the organisms internal structures could not be viewed as a scanning electron microscope only provides images of the surface!

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.