Ways that a single tree may be involved in the carbon cycle

A single tree absorbs tons of carbon dioxide in its 30-year life cycle that produces tons of oxygen.

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.