It can’t be a coincidence that almost all of them have red blood. Why can’t it be blue? Green? Purple?
In: Biology
Because most animals have a oxygen transporting blood cell which uses the molecule haemoglobin as an oxygen transporter. Haemoglobin is famous for it’s iron (Fe) content, which imparts the reddish color, especially when oxygenated . Horseshoe crabs have copper based oxygen carry systems and their blood is blue
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