You're very close! That's a good description of a key part of evolution, but it's not the whole story. Here's a more complete explanation:

Evolution is the process by which populations of organisms change over time. This change happens through a combination of factors:

* Variation: Individuals within a population have slightly different traits. This variation comes from mutations in their genes.

* Selection: The environment favors certain traits, meaning that individuals with those traits are more likely to survive and reproduce. This is often referred to as "survival of the fittest," but it's important to remember that "fittest" means best adapted to the specific environment, not necessarily the strongest or fastest.

* Inheritance: The traits that are favored by the environment are passed on to the next generation. This means that over time, the frequency of those traits in the population increases.

So, to summarize, evolution is not just about the best-adapted individuals surviving, but also about how those traits are passed on and become more common over time. This leads to populations changing and adapting to their environment.