How does this punnett square answer our guiding question? “How is it possible that siblings with the same parents can have such different traits, such as skin tone?”

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.

well the answer is 2!