Blood is always red, right? Wrong. Blood comes in a variety of colours. It may be red in humans and other mammals, but octopus for example have blue blood. And ocellated icefish have blood that is completely clear. And in Papua New Guinea there are green-blooded skink. So don’t be fooled into thinking blood is always red. In this video we are going to discover what blood is made of and the roles of the different components.
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