The evolution that involves changes in a species over time to produce adaptations that allow the organism to better survive its environment is called natural selection.

Here's how it works:

1. Variation: Individuals within a species have natural variations in their traits.

2. Competition: Organisms compete for resources like food, shelter, and mates.

3. Survival of the Fittest: Individuals with traits that make them better suited to their environment are more likely to survive and reproduce.

4. Inheritance: These beneficial traits are passed down to their offspring.

5. Evolution: Over many generations, these advantageous traits become more common in the population, leading to changes in the species as a whole.

This process of natural selection drives the evolution of adaptations, which are traits that increase an organism's chances of survival and reproduction in its specific environment.