Here's a breakdown:

* Phenotype: The observable characteristics of an organism, resulting from the interaction of its genotype (genes) with the environment. This includes physical traits, behaviors, and even physiological processes.

Let's illustrate this with an example:

Imagine a population of rabbits living in a forest with a mix of brown and white rabbits.

* Genotype: The genes responsible for fur color.

* Phenotype: The actual color of the rabbit's fur (brown or white).

Now, let's say a predator, like a fox, is better at spotting white rabbits against the forest background.

* Natural Selection: The white rabbits are more likely to be preyed upon, leading to fewer white rabbits reproducing and passing on their genes. This means the brown rabbits have a better chance of survival and reproduction.

* Evolutionary Outcome: Over time, the population will shift towards having a higher proportion of brown rabbits.

Important Note: While natural selection acts on phenotypes, it ultimately leads to changes in the underlying genotypes of a population, as genes responsible for advantageous traits become more prevalent.