what is the connection of evolution, microevolution, and natural selection And descent with modification. Please explain in simple way as possible. We're going to have a big test and it would be...

what is the connection of evolution, microevolution, and natural selection And descent with modification. Please explain in simple way as possible. We're going to have a big test and it would be explanations. I still dont get evolution! If you can also include the terms fitness, survival of fittest, adaptation in your explanation it would be better. Thank you!

Asked on by yanie8888

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trophyhunter1 | College Teacher | (Level 1) Educator Emeritus

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Evolution refers to change over time. Life has evolved during the course of history. The fossil record, geologic record, DNA evidence and biochemical evidence all support this idea. Natural selection is the theory put forth by Charles Darwin. He provided an explanation as to how evolution occurred on earth. He believed living things overpopulate. They have natural variations which make them all slightly different. They will experience a struggle for existence, competing for food, space and mates. Any variations that provided an advantage might be selected for by nature and these individuals would survive and reproduce--survival of the fittest. Over time, when enough of these variations accumulate in the offspring, evolution of a new species would occur. Microevolution is the notion that allele frequencies change in a population over time. Alleles are genes. This can be due to mutation, selection and genetic drift. An example of microevolution can be seen in the peppered moth. Originally, these moths were almost exclusively white colored, with a small percentage of black moths. As the air quality of the forest changed due to the industrial revolution, the black moths over time replaced their white counterparts. This is due to selection. The white moths against the soot covered trees stood out and were eaten by predatory birds--natural selection. Within 100 years of microevolution, the dark moths replaced the white moths in the population of peppered moths. This reversed again, when air pollution laws were enacted. 

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