Question

why other organism blood colour is red? explain why octopus colour is blue?

Answer 1

The Antarctic octopus, pictured, has a copper-rich protein in its blood that turns the vital fluid blue. ... The bluecomes 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.

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Answer 2

Answer:

Blood is red because it is made up of cells that are red, which are called red blood cells.Within the red blood cells there is a protein called hemoglobin. Each hemoglobin protein is made up subunits called hemes, which are what give blood its red color.

while octopus doesn't contain hemoglobin in its blood that's its blue in colour