What pattern of inheritance does this pedigree chart represent? (squares are male/circles are females
a. y-linkedb) x-linked dominant traitsc) x-linked recessive traitsd) autosomal recessive traits

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.