Darwin's general theory presumes the development of life from non-life and stresses a purely naturalistic undirected "descent with modification". That is, complex creatures evolve from more simplistic ancestors naturally over time.
Ok, go to the window. Or better yet, step outside.
A squirrel darts past. Trees and weeds surge up towards the sky. Birds tickle the air. And all of it—even you—is shaped by the most incredible of forces. Evolution essentially multiplies majesty by majesty by majesty.
It was 5 years. And that voyage made him into a thinker. He was just a great naturalist—he saw things out in nature, and he asked: As in, why is there such a stunning diversity of life?
Why are similar looking species sometimes located on opposite sides of the planet? It was Darwin and Alfred Russel Wallace — who independently puzzled out a mechanism behind evolution.
Which was natural selection. And it depends on two key ingredients. The first is some way of getting features, or traits, to be inherited from one generation to the next, which usually means reproduction.
The second is variation. If organisms were to make exact duplicates of themselves every time they reproduced, nothing would change. Whatever it is, organisms compete for resources. And this is where selection comes in. For instance, scientists believe that a few hundred thousand years ago, before there were polar bears, some brown bears got stranded in the Arctic.
The few that survived likely had fur coats that were a bit thicker, and lighter in color than the others. The point is—not all variations make it. And the things that survive go on to reproduce. In other words, survival of the fittest. Fittest in an evolutionary sense is whoever has the most descendants.
In the Arctic, the bears with thicker and whiter coats survived more often and had more offspring — offspring that inherited the thicker and whiter fur. And gradually, other changes accumulated too.Introduction On of the most important contributions made to the science of evolution by Charles Darwin is the concept of natural selection.
The idea that members of a species compete with each other for resources and that individuals that are better adapted to their lifestyle have a better chance of surviving to reproduce revolutionized the field of evolution, though it was not accepted until.
Unlike Lamarck, Darwin did not believe that evolution inevitably produces more complex life forms and that the ultimate result of this process is humans.
These were shocking, revolutionary ideas even for scientists who accepted evolution. Darwin did not rush his .
Charles Darwin was born into a moderately wealthy family in Shrewsbury, England. His father, Robert, had the largest medical practice outside of London at the time and his mother, Susannah Wedgwood, was from a family of wealthy pottery manufacturers.
Charles Robert Darwin was born in Shrewsbury, Shropshire, on 12 February , at his family's home, The Mount. He was the fifth of six children of wealthy society doctor and financier Robert Darwin and Susannah Darwin (née Wedgwood). He was the grandson of two prominent abolitionists: Erasmus Darwin on his father's side, and Josiah Wedgwood on his mother's side.
Sexual selection, which Darwin believed was distinct from natural selection, involves the selection of traits based on their role in courtship and mating. Artificial selection is the selective breeding of species by humans to increase desirable traits, though the traits do not necessarily have to confer greater fitness.
Darwin's Theory of Evolution - Natural Selection While Darwin's Theory of Evolution is a relatively young archetype, the evolutionary worldview itself is as old as antiquity. Ancient Greek philosophers such as Anaximander postulated the development of life from non-life and the evolutionary descent of .