Answer:
1 goes with b. 2 goes with a 3 goes withd 4 goeswith c
Explanation:
Oxygen and carbon dioxide travels to and from tiny air sacs in the lungs, through the walls of the capillaries, into the blood. Blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs.
Traits are determined by genes
<span />
