1. Observation: There is variation within populations of organisms.
Inference: This variation is not random; it is heritable, meaning offspring tend to inherit traits from their parents.
2. Observation: Resources are limited and competition exists for those resources.
Inference: Individuals with traits better suited to their environment will have a higher chance of surviving and reproducing, passing those advantageous traits to their offspring.
3. Observation: Populations have the potential to grow exponentially, but populations tend to remain relatively stable.
Inference: This implies that a significant proportion of offspring do not survive to reproduce. The individuals that survive are those with advantageous traits that allow them to outcompete others in their environment.
These three inferences combined led Darwin to propose the theory of natural selection:
* Individuals within a population vary.
* Some of these variations are heritable.
* Individuals with advantageous variations are more likely to survive and reproduce, passing on those advantageous traits to their offspring.
This process of natural selection, over generations, leads to the evolution of populations, with individuals becoming better adapted to their specific environment.
