The theory Darwin had was that all species are connected in the tree of life and believed the evolution exists. Therefore, natural selection occurs and variations within a species may happen. Over the years, technology has advanced and with that technology, a scientist is able to look inside of an organisms DNA. In doing so it proved Darwin’s theory to be true because of how organisms genes changes and over time adapting to have the better chance of survival and reproduction. With all this information, scientists are able to piece together how minimal changes in the genes can alter the evolution of an organism. The way you can tell that an animal could have a common ancestor is by observing their body parts and how they may have similar body parts to another animal but would be functioning differently. Not only does it mean they may have a common ancestor but they could have just adapted it from the other animal. The variation of species could be the result of having kind of mutation that may have occurred the replication process from the parents to the offspring. Because of the mutations, the species come out completely different than what you may have expected.
in the video, they showed us the the pocket mice is also an example of natural selection. In the video, they showed us the different types of pocket mice and the only difference was the coloration of their furs. One of the mice shown had a light beige color and the other one was darker or black. Its hard to believe but, their furs naturally change colours from adapting to different environment. Because of the different colouration of their fur, they have the ability to protect themselves from predators and stay hidden. The second example was the giant tortoises. The shells of these tortoises had very different shells but they were from the same island. Just like the finches, depending on where the tortoise is located they have a specific look to their shells. They had two major shapes to their shells. Those of which included a shell shaped like a saddle and a dome shape. The shapes of the shells help the tortoise to adapt to the way they obtain food and also the location on the island. Those with a saddle shape shell makes it easier for the tortoise to lift up their heads to reach the food higher up from the ground. Whereas, those with a dome-shaped shell make it easier for them to reach the food closer to the ground. Lastly, the video showed us the variety of finches that were in different parts of the island. Depending on the area of the island, the finches had different beaks. Based on this, Darwin proposed that the beaks were different because they are used as tools to obtain food and other resources. When variations of animals are produced from a common ancestor, they have to adapt to the environment they happen to live in. The finches were able to adapt to their environment.