Natural selection is the process where organisms become better fitted to their environment and they survive and produce more. Natural selection contributes to the theory of evolution which is when a population gets heritable characteristics over a period of time which sometimes can cause speciation. Three things that support The evolutionary theory are fossils and how they show change, Darwin’s finches, and how organisms can adapt to become resistant. Fossils are a great way to show how evolution happened over the years, for example the pakicetidae. The pakicetidae lived 50 million years ago and is the extinct family of early whales.
The pakicetidae had very similar skull to today's whales but the only difference is the nostril placement, pakicetidae
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The aetiocetus nostrils are on the middle of it’s skull.
This connects the pakicetidae to whales by showing how the pakicetidae’s nostrils started at the front of the skull then after many years the aetiocetus shows how the nostril moved back to the middle of the skull and finally the nostrils moved all the way back which is now what is on our modern day whales.
Darwin’s finches is an excellent way of showing speciation and adaptation. When Darwin traveled to the galapagos islands he noticed a bunch of birds and he thought they were all different birds, but he later finds out that they were all finches. The different thing about them is they all had different beaks. The finches developed different beaks over time because they were geographically isolated and that made them reproductively isolated causing change. Finches don't like to fly over large bodies of water so the finches on one of the islands could only have a food source of berries leading them to evolve or adapt to have a certain beak shape that allowed them to eat their food better. Same with the other islands. Since they had different beaks they would also become reproductively isolated because certain finches were only attracted