The theory of evolution was developed by Charles Darwin and publishing in his book “On the Origin of species”. In that book he explained that natural selection is a process behind evolution. Charles Darwin developed his theories after his adventures around the world. In his travels he observed that creatures found in the islands he visited were similar to ones found in the mainland. But those are appeared to be slightly different. It wasn’t until you returned home that he came to the conclusion, those species are specially modified to their environments. And that’s why they differ. He developed for conditions explain why this happens. “Darwin’s theory of natural selection” is testable and observable fact. Experiments, have been conducted in the wild and in labs.
let’s dive deeper into Darwin’s four conditions.
Condition number 1
Individuals within a population differ.
There are features that differ within populations of the same animal. In our case, the feature that varies between our giraffe’s neck length, some giraffe’s were born with long necks, some were born with short necks,
Condition number 2
The differences are at least in part passed from parents to offspring.
Darwin’s descent with modification is the idea that offspring are fairly similar to their parents, with some genetic differences.
Condition number 3
Some individuals are more successful at surviving and reproducing than others. In the case of our giraffe, the long neck individual did not acquire its neck by stretching to grab the leaves. Instead individuals within the population were born with the neck length that was longer than others. Because a longer neck allowed them to reach the food that was otherwise unattainable. It gave them an advantage.
Condition, number 4
The successful individuals succeed because of variant traits they have inherited and will pass on to their offspring.
Jirafs With the longer neck advantage are in better health and able to pass this feature to their offspring. Because this trade is more successful than shorter necks, more individuals in the population have it. Over time this process can result in populations that specialized for particular environments and may eventually result in emergence of new species. In other words natural selection is an important process, though not the only process, by which evolution takes place within a population of organisms. let’s review
1) Individuals within a population differ.
2) The differences are, at least in part, passed from parents to offspring.
3) Some individuals are more successful at surviving and reproducing than others.
4) The successful individuals succeed because of variant traits they have inherited and we’ll pass on to their offspring.