👉 A chordata is a type of animal that has two hearts, one for oxygenation and another for carbon dioxide removal. These organs are connected by a tricuspid valve which allows for an exchange of gases between the blood and the air in the lungs. In contrast to other animals like reptiles or birds, which have only one heart per organ, chordata have two hearts that work together to perform various functions such as respiration, digestion, and reproduction.