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Genuine, but also probably stupid, question about evolution: but why haven't some species evolved? Eg, horseshoe crab?

[media=https://youtu.be/aiqTFp-DJa8]


Not trying to prove anything by asking this, just something I been thinking about 😬
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If their current form allowed them to survive longer than any other species, there may not be a need to evolve.
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