Like many complex systems, ecosystems tend to show cyclical variations around an approximate equilibrium state. But in the long run, ecosystems inevitably change when the climate changes or when very different new species appear as a result of migration or evolution (or are introduced intentionally or unintentionally by humans). A well-known observation is that the descendants are very close to their parents, but they nevertheless have some variations: the descendants are a little different from their parents and from each other. For many generations, these differences can accumulate, so the appearance and behavior of organisms can be very different from their distant ancestors. For example, people have raised their pets and plants to choose desirable properties; The results are modern varieties of dogs, cats, cattle, birds, fruits and grains that differ significantly from their ancestors. Changes have also been observed in grains, such as large enough to produce new species. In fact, some branches of descendants of the same parental species are so different from others that they can no longer reproduce with each other. Teachers face difficult choices to decide what to teach in their limited time, but some ideas are essential in each discipline. In biology, evolution is an idea.
Biology is sometimes taught as a list of facts, but if evolution is introduced early in a classroom and in a simple way, it can combine many different facts. Most importantly, it offers a way to understand the incredible complexity, diversity and activity of the modern world. Why are there so many different types of organisms? How does a species or community respond to changes in the environment? Why is it so difficult to develop antibiotics and insecticides that are useful for more than a decade or two? All of these questions are easy to discuss in terms of evolution, but they are also difficult to answer. One of the arguments sometimes put forward by advocates of “creative science” is that natural selection can lead to minor changes within species, such as. B sizes of colors or beaks, but cannot produce new species from existing species. However, evolutionary biologists have documented many cases where new species have emerged in recent years (some of these cases are examined in Chapter 2). Among most plants and animals, speciation is an extensive process, and only one human observer can attend part of this process. But these observations of evolution in the workplace strongly confirm that evolution forms new species. Science is a way to know the natural world. It is limited to explaining the natural world by natural causes. Science can`t say anything about the supernatural. Whether God exists or not is a question of which science is neutral.
Evolution is a process of connection or division in which populations gradually separate and differentiate. When the two groups are isolated from each other, they stop sharing genes and eventually the genetic differences multiply until the group members can no longer mix. This is where they became separate species. Over time, these two species could create new species, and so on through millennia. The Kambrian fossils did not appear spontaneously. They had ancestors in the pre-inclusion period, but because these pre-crested forms were soft bodies, they left fewer fossils. One of the characteristics of Cambrian fossils is the evolution of the hard The question of evolutionary change in relation to available geological time is indeed a serious theoretical challenge, but the reasons are exactly the opposite of what is inspired by the intuition of most people. In general, organizations have not evolved as strongly as we should reasonably expect.