How do we know that the moths envolved

The Theory of Evolution, 1966, p. 137 states "change of color over time"

Explanation: There are so many different theories. So based on your own to how things were evolved. This is mine.  

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.

that is true   : ) hope this you