10 points
Cells in your body get oxygen they need and get rid of carbon dioxide
waste through the? *

A. Digestive System
B. Respiratory System
C. Nervous System
D. Circulatory System

Respiratory System

Explanation:

The respiratory system's primary organ is the lungs which take in oxygen adn expel CO2

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 probably to later but whats the question