ACTIN & MYOSIN are that proteins
The respiratory system's main function is to exchange oxygen and carbon dioxide gases within the body. The organs that make up the respiratory system include the nose, pharynx and larynx, the trachea, bronchi, and the lungs. Each of these organs help with the process of breathing and/or the exchanging of gases within them. :)
fifteen to twenty months.But my brother started to refuse before that but he stopped for good at fifteen months
