Which of the following shows all four chordate characteristics?
A. Larval and adult urochordates
B. Larval cephalochordates and adult urochordates
C. Larval urochordates and adult cephalochordates

i think the answer would be d

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.