Your brain does it automatically for you. Your lungs contain almost 1500 miles of airways and over 300 million alveoli. Every minute you breathe in 13 pints of air. Plants are our partners in breathing. We breathe in air, use the oxygen in it, and release carbon dioxide.
Plants take in carbon dioxide and release oxygen.
People tend to get more colds in the winter because we're indoors more often and in close proximity to other people.