Question

which organism gives blue blood and why?​

Answer 1

Answer:

spider, octopus and some of them have blue blood

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Answer 2

Answer:

The blue comes from a copper-rich protein called hemocyanin, which carries oxygen from the lungs to the bloodstream and then to the cells of the octopus's body. Hemoglobin, an iron-containing protein found in the blood of other animals—including humans—serves the same oxygen-transporting function but turns blood red