Charles Darwin published a game-changing book, The Origin of Species, in 1859 to explain his theory about how all species of life originated. It challenged the era's conventional wisdom which said that the Creator God specially designed each type of creature.
Darwin claimed that all life of every type descended from one unknown original life form, changing gradually through its generations. When a change (variation) helped a life form to survive and reproduce, there were eventually more of this variety of plant or animal life. This happened countless times, slowly and gradually changing generations of life forms over enormous time spans, resulting in all the species of earth's history.
Certainly species change (micro-evolution) over time by a process (natural selection working on variations) which is undisputed today. But could this process have produced all the different species of life on earth (macro-evolution)? That is far from proven, and it is disputed.
Darwin was not cocky about his theory. He had doubts, and was humble enough to admit them.
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