plants use carbon dioxide for photosynthesis. how is the carbon dioxide in the air replaced Share with your friends Share 0 Poojal Katiyar. Katiyar answered this plants release oxygen which humans take and release carbon dioxide 1 View Full Answer Bibhu Kalyan Sahoo answered this By the interdependence of plants and animals as plants take iN carbon dioxide and give out oxygen and we animals take in oxygen and give out carbon dioxide 1