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View submission: Ask Anything Wednesday - Engineering, Mathematics, Computer Science
this is a complete hypothesis, but....
Blue is pretty damn close to the UV spectrum. If there was a pigment that appeared blue, then that would mean that it absorbs every other color *but* blue.
Such a pigment would also not stop UV light from damaging the host organism's tissues, and probably cause a lot of problems.
As for blue blood, it is caused by presence of a copper-containing molecule instead of iron-containing hemoglobin in the blood. Moreover, said molecule is not bounded to any blood cell, but floats freely inside the plasma.
It's great for when temperature fluctuations might be high, but has poor oxygen carrying capacity when compared with good ol red blood.
There's nothing here!