One early crocodile relative looked somewhat like a greyhound, with long legs and a sleek body. What things might this "design" have helped the ancient crocodile accomplish?

c. heat from the poles back down towards the equator.

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.

its b. greenhouse gasses trap uv rays for heat so that the plants stay alive.