Charles Darwin's observations that finches of different species on the Galapagos Islands have many similar physical characteristics supports the hypothesis that these finches A all eat the same type of food. B acquired traits through use and disuse. C descended from a common ancestor. D have the ability to interbreed.

C descended from a common ancestor

Explanation:

Darwin’s voyage which included an exploration of the Galapagos Islands led him to discover that there are several different species of finches on the various Islands of the Galapagos. More interesting is the fact that, these finches he found on the various Islands of the Galapagos have similar physical characteristics with that of the finches from other parts of South America compared to those in other islands of the world. This finding supports the hypothesis that these finches descended from a common ancestral population of South America birds that eat seeds.

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.