Natural selection is like a game where the strongest or smartest players get to stay and play more, and they pass on their good traits to the next round.
Imagine you have a group of squirrels who all live in the same forest. Some are really fast, some are not so fast. One day, a big storm comes, and there’s a fire in the woods. The fast squirrels can run away quickly and find new food, while the slower ones might get stuck or burned. Those fast squirrels survive and have babies. Their babies also tend to be fast.
Over time, more and more of the squirrels are fast, because being fast helps them live longer and have more kids. That’s evolutionary change happening right in front of your eyes!
How it works step by step
- Variation: Not all squirrels are the same, some are faster than others.
- Selection: The fire picks out the best ones, the fast ones survive.
- Inheritance: Those fast squirrels have babies who also tend to be fast.
- Change over time: More and more fast squirrels, the forest changes.
It’s like when you play tag: if you’re faster, you get to tag more people and win more often!
Examples
- A deer with a faster speed survives better during a harsh winter.
- Bacteria that are resistant to antibiotics multiply more quickly.
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See also
- Why haven’t particular traits that one might consider advantageous to an organism?
- What are fitness trade-offs?
- Why are there no wheeled animals?
- How does natural selection drive the evolution of species?
- How did Life Come onto Land?