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==='''Chemical reaction video magic'''===
==='''Chemical reaction video magic'''===
{{#widget:YouTube|id=gOqdp9T-gXo}}
{{#widget:YouTube|id=gOqdp9T-gXo}}
===Which animal blood is blue in colour? ===
Horseshoe crab blood is is bright blue bcoz of copper-based hemocyanin to transport oxygen where vertebrates use iron in hemoglobin.
{{#widget:YouTube|id=e8KlAmtIu1E}}