Comments by "Jack Haveman" (@JackHaveman52) on "Kurzgesagt – In a Nutshell" channel.

  1. The fossil records shows different species living in different time frames. You will never find the fossils of birds, mammals, humans, flowering plants in the Cambrian period. Each species has its own life history within its own geological era. More significant is that the fossil record shows a progression of life from the simplistic to more complex as time goes on. As this time goes on, the number of different species increase dramatically until there is an extinction event. Suddenly, the diversity of species disappears and life becomes less diverse and simplistic. From that point on, the fossil record shows another increase in complexity and species diversity. This will go until the next extinction event and the process repeats. This has been clearly recorded in the fossil record and verified innumerable times by researchers. You couple this with other evidence from other sources, it becomes more and more apparent that the process of evolution is the most likely explanation for the verifiable fossil record. There has to be an explanation for this record and evolution appears to be the best explanation to answer this and other biological questions.
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  2. Why not. I grew up on a farm. I've seen animals having sex since before I went to school. Everyone that grew up on a farm that raised any kind of livestock were witnesses to animal sex, routinely. By the time I was 8 or 9, I knew that if the cows were mounting one another, it was time to get a bull for breeding and would inform my dad what I saw. Most of us figured out human sexuality by a constant exposure to animal sex. It's as normal as watching cows defalcating or urinating. A natural process of life.
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  3. If it is possible to do it intentionally, it can be done naturally. What has to happen is those intentional arrangements has to occur, by chance, in a natural setting. For example, radiation can affect chromosomes. So can some types of toxins. If a creature is exposed to a toxin in the wild, ingesting a toxic plant as an example, it may affect that creature chromosomes. That affected chromosome could get passed on to its offspring. If this happens just a few times over millions of years, the descendant may look and behave completely differently than than an ancestor that lived millions of years previous. More importantly, it may have lost its ability to breed with that ancestor. It's now a different species.
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