They show evidence of other life beyond us, when we see fossils they give is info that can determine other scientific data that is important for human life
blue-violet (chlorophyll a) & red (chlorophyll b). that's why it appears to be green.
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Researchers also found that the longer a male's tail feathers, the faster he was able to shake them. This effort would require more muscular strength, and might be a powerful signal of fitness to the females.
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