It can’t be a coincidence that almost all of them have red blood. Why can’t it be blue? Green? Purple?
In: Biology
All life that has blood has it because it needs to transport oxygen from its environment to its tissue. To do this, it needs to bind the oxygen to something that really likes oxygen. There are only really two good candidates for this: iron and copper. When iron reacts with oxygen, it rusts and turns red. When copper reacts with oxygen, it turns turquoise. Therefore, the color of your blood is determined by which element your body uses to transport oxygen. For us, that’s iron. For other creatures like bugs and crustaceans, that’s copper.
Latest Answers