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Grass is green because of a compound called chlorophyll, which is what allows plants to turn sunlight into energy (similar to how people turn food into energy).
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@laravdw: Kyler is right. The only thing to add is the reason we perceive the grass as green is because Chlorophyll absorbs blue light (high energy, short wavelengths) and red light (low energy, longer wavelengths) well, but mostly reflects green light, so our eyes see it as green.
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And the fascinating thing is that every living thing on Earth that can do this trick (turning sunlight, water and carbon dioxide into complex carbohydrates) does it in exactly the same way.
Its as if evolution never found a better way of doing it.
And that also tells biologists that all plants are descended from a common ancestor that first learned the trick.
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The other guys have nailed it but it’s worth considering that we are only able to see visible light, which is a small part of the electromagnetic spectrum (which includes things like radio waves, microwaves, x-rays, UV light, etc). So not only does grass reflect green light, we are programmed to see this colour. Animals/insects (e.g. butterflies and birds) and plants (e.g. flowers) can have markings that are only visible in the UV region, meaning humans can’t see these markings.
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