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What is convergent evolution?

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Quick answer

Convergent evolution is when unrelated species independently evolve similar features because they face similar challenges. Wings on birds, bats, and insects, or the streamlined shapes of sharks and dolphins, evolved separately yet ended up alike. Different lineages arrive at similar solutions to similar problems.

Key things to understand

  1. Different lineages arrive at similar solutions to similar problems.
  2. The shared trait isn't inherited from a common ancestor — it evolved more than once.
  3. Examples: camera-like eyes in octopuses and humans, wings in birds and bats.
  4. It shows environments push life toward certain effective designs.
  5. It contrasts with divergent evolution, where relatives grow apart.

People also ask

What is an example of convergent evolution?
Sharks (fish) and dolphins (mammals) both evolved sleek, finned bodies for fast swimming, despite not being closely related.
How is it different from sharing an ancestor?
The similar trait wasn't inherited — each lineage evolved it independently because the same pressure favored it.
Why does convergent evolution happen?
Similar challenges (flying, swimming, seeing) have a limited set of good physical solutions, so natural selection finds them repeatedly.