Only 1 in 10 plant has the colour blue and far fewer in the animal kingdom, most of them are due to the effect of light on their body and not due to their physical appearance. why is it so rare if flying predator can easily hide themselves?.
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Simply put, most plants and animals are made from carbon and other nonmetallic elements. Those elements don’t have many chemical bonds that reflect just blue light because of the energy associated with blue light and the chemical bonds in organic chemistry. We’ve been able to incorporate transition metals into our dyes and those elements do produce blue light but are not widely incorporated in organic dyes.
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