Even though, Charles's children were sibling coming from the same parents, they looked different. He started to notice all of these small variations between animals of te same species. Darwin Suggested that these variations would decide who would live, and who will die, also known as survival of the fittest.
Darwin then created the vision of evolution by natural selection. He noticed though, that even though he did so much work, he didn't know how these species were changing, he didn't know what the change was, he acknowledged this, but he didn't get the chance to study more.
Today, modern science is picking up where he left off, by looking inside the animals' DNA. Darwin didn't have the resources to do this. It has taken the study of evolution to the next level. People are now realizing that all creatures contain one long molecule, spiraling around as a double helix, made up of smaller molecules. These are the codes of life. That any specific DNA strand, and you can trace the exact animal it came from, much like finger prints, no DNA strand is the same.
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