Photosynthetic pigments evolved multiple times on earth (see http://www.ucmp.berkeley.edu/glossary/gloss3/pigments.html and also http://en.wikipedia.org/wiki/Photosynthetic_pigments). Doesn't that make it considerably more likely that an Earth-like exoplanet would also evolve such pigments (not necessarily any of the ones found here, either)?
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Photosynthetic pigments
Date: 2016-10-23 01:07 am (UTC)Mia