How does natural selection drive the evolution of complex life forms?

Examples

1. A giraffe with a longer neck can reach more leaves, so it survives better and passes on its long-neck trait.
2. Fish in a lake start to have lighter scales because the water is clearer now.
3. Bees that find flowers faster are more likely to survive and reproduce.

See also

• How does natural selection drive evolutionary change?
• How does natural selection drive the evolution of species?
• What are evolutionary pressures?
• Why are there no wheeled animals?
• What are fitness trade-offs?

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