Blood in Many Colours !
(Nature Does Not Follow One Colour Rule) We all know one common fact: 👉 Human blood is red. But have you ever wondered… Is blood red in every living creature? The answer is No. Nature is full of surprises. Some animals have: 🔵 Blue blood 🟢 Green blood 🟣 Purple blood 🟡 Yellow blood ⚪ Even colourless blood This proves one important truth: Nature never follows just one design. Why Human Blood is Red Human blood looks red because it contains a protein called haemoglobin . Haemoglobin contains iron . When iron combines with oxygen, blood becomes red. This helps transport oxygen throughout our body. Blue Blood Animals Animals like: Octopus Squid Horseshoe crab Some crabs have blue blood . Their blood contains hemocyanin instead of haemoglobin. Hemocyanin contains copper . When copper combines with oxygen, the blood appears blue. This system works well in: cold oceans low oxygen water That is why many marine creatures use this method. Green Blood Creatures Some rare lizards ...