1. Overproduction: Organisms produce more offspring than can possibly survive. This is due to the inherent drive to reproduce and ensure the continuation of the species.
2. Variation: Individuals within a population exhibit variations in their traits. These variations can be inherited and arise from mutations, genetic recombination, and other factors.
3. Competition for Resources: Organisms compete with each other for limited resources like food, water, shelter, and mates. This competition can be direct (fighting for resources) or indirect (competing for the same limited resource).
4. Survival of the Fittest: Individuals with traits that give them an advantage in their environment are more likely to survive and reproduce. These advantageous traits can be anything that helps an organism find food, avoid predators, or withstand harsh conditions.
5. Inheritance and Adaptation: The successful traits are passed on to the offspring, leading to a gradual change in the population over generations. This process, called adaptation, results in populations becoming better suited to their environment.
Important Note: The theory of natural selection is a core principle of evolutionary biology. It's important to remember that natural selection is a process, not a force. It simply describes how organisms with advantageous traits are more likely to survive and reproduce, leading to changes in populations over time.
