Ancient viral fossils buried in our DNA are offering fresh clues about how today’s respiratory pathogens infect and spread. By tracing the shared architecture between long-extinct retroviruses and ...

The respiratory system is responsible for the exchange of carbon dioxide and oxygen in the human body. This system also helps remove metabolic waste products and keep pH levels in check. The major ...

The respiratory system allows air to reach the lungs, from which oxygen enters the blood and circulates to all body cells. This system also removes waste gases from the body and helps prevent disease ...