(EVOLUTION) Fill the blanks   describes long periods of status bound by episodes of sudden change

-The change in the genetic makeup of population due to change is called

sex cells are usually half's then they find another half and make a fertilize egg

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.