It can’t be a coincidence that almost all of them have red blood. Why can’t it be blue? Green? Purple?
In: Biology
The majority of animals on earth are insects, and they don’t have red blood, so your premise is incorrect. As other have stated, it’s red because of the haem molecule which is made of iron. But other animals have different colours as they have different molecules in their blood, and they far outnumber the red ones.
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