Do snails have blood?
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                            Snails, spiders and octopi have something in common- they all have blue blood! ... Unlike mammals, snails, spiders and octopi do not use hemoglobin to transport oxygen but rely on a related compound known as hemocyanin. This molecule, instead of having an atom of iron in its middle, has an atom of copper that binds oxygen. 
                    
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                                   Snails, spiders and octopi have something in common- they all have blue blood! ... Unlike mammals, snails, spiders and octopi do not use hemoglobin to transport oxygen but rely on a related compound known as hemocyanin. This molecule, instead of having an atom of iron in its middle, has an atom of copper that binds oxygen. 
                                
                            
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