“Briefly outline the geographical history of the Galapagos and propose hypothesis to explain the origin of the original habitants of the Galapagos”

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.

garbage disposal because lysosomes dispose of old cell parts like garbage disposals dispose of old food.