These illustrations represent different levels of adaptive complexity we might imagine when thinking about aliens. (a) A simple replicating molecule, with no apparent design. This may or may not undergo natural selection. (b) An incredibly simple, cell-like entity. Even something this simple has sufficient contrivance of parts that it must undergo natural selection. (c) An alien with many intricate parts working together is likely to have undergone major transitions. Credit: Helen S. Cooper
What evolutionary biology tells us about how aliens could look. For the first time, researchers show how evolutionary theory can be used to support alien predictions and better understand their behavior...
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