If adventure has evolved, then ( tell me if it will be possible to observe differences in morphology by examining its fossil record)

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.