Why do we have different blood groups?
We discover some likely explanations for the different blood groups seen in humans. Is there any reason for having one blood type over another? Do other animals have them too? Plus, we ask: why do horses, donkeys and zebras all make different noises?
Download as mp3
I have a question regarding blood types. Why do we, humans have different types of blood, and is it an evolutionary thing? where does it come from and what’s the purpose of it?