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