Organisms don’t all reproduce the same way. however, by comparing the of these organisms, many similarities between them are revealed. these similarities suggest that they’re linked. this type of study is called developmental biology.

Organisms don’t all reproduce the same way. However, by comparing the embryo of these organisms, many similarities between them are revealed. These similarities suggest that they’re evolutionary linked. This type of study is called developmental biology.  

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.