There are nettles, and there are false nettles that look very similar to nettles when not in flower. Given that the plants can’t see each other to imitate, how did the false (non-harmful) plant develop to be so visually similar to the harmful one?
The plant offspring have random genes. Some of those genes cause them to look somewhat like nettles. These plants have a higher chance of surviving and passing their traits on to the next generation.
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