Blood circulating in your body.
The answer is false there were only types the saurischians and the ornithischians.
Hemoglobin is an important component of red blood cells that functions in transporting majority of oxygen in the body. One hemoglobin can bind to up to four oxygen molecules because of its four subunits. If the oxygen carrying ability of hemoglobin is decreased, carbon dioxide and temperature will increase and pH will decrease.
By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other. Often we can work out how and where they lived, and use this information to find out about ancient environments. Fossils can tell us a lot about the past.
