What book did Darwin write? What did it introduce the world?

The Origin of Species argued that either all life originated from a single ancestral form and evolved into all species exactly as they are today, or all life originated from descent with modification from that one ancestral form.

The laws of inheritance were unknown at the time, and Darwin mistakenly believed that there were endless possibilities in germ cells. Natural selection would cause those possibilities that were best suited to the environment to survive and pass on their characteristics to their offspring, causing an irreversible increase in complexity. This idea explained how all life could be related by the tree of life, which he called descent with modification and is now known as Darwinian Evolution or just Evolution. Darwin proposed that all forms of life could have arisen through natural selection using analogies from artificial selection.

The concept known as Darwinian Evolution eliminated the need for the supernatural to explain how life originated by introducing the world to a purely naturalistic way of thinking about life.

Charles Darwin wrote "On the Origin of Species," which introduced the world to the theory of evolution by natural selection.

Charles Darwin wrote the book "On the Origin of Species." This seminal work introduced the world to the theory of evolution by natural selection.