Here's how it works:
* Fossil Evidence: Darwin observed fossils of extinct organisms, showing that life forms had changed over time. He saw evidence of transitional forms, hinting at gradual change.
* Modern Organisms: Darwin also studied modern organisms, noting variations within species. He recognized that these variations could be advantageous or disadvantageous in different environments.
* Inheritance of Traits: Darwin didn't fully understand the mechanism of inheritance, but he knew that traits were passed down from parents to offspring. He hypothesized that these variations, influenced by the environment, could be passed on.
* Natural Selection: Darwin concluded that individuals with advantageous traits are more likely to survive and reproduce, passing those advantageous traits to their offspring. Over time, this process of natural selection leads to changes in the overall population, driving evolution.
In short, Darwin's theory of evolution by natural selection states that genetic changes (variations) are passed down through inheritance, and those changes that provide a survival advantage are more likely to be passed on to future generations, leading to the gradual evolution of species.
