Here's how it works:

* Variation: Individuals within a population have slight differences in their traits.

* Heritability: These traits are passed down from parents to offspring.

* Differential Survival and Reproduction: Individuals with traits that are better suited to their environment are more likely to survive and reproduce, passing on those advantageous traits.

Over many generations, this process leads to changes in the genetic makeup of a population, resulting in the evolution of new species or adaptations within a species.

Think of it like this:

Imagine a population of rabbits living in a forest. Some rabbits have brown fur, and some have white fur. If the forest has lots of predators that can easily spot white rabbits, brown rabbits will be more likely to survive and reproduce. Over time, the population will have more brown rabbits because they are better suited to their environment.

This is just one example of how natural selection drives evolution. It is a powerful force that shapes the diversity of life on Earth.