Natural selection in a way weeds out the less favored traits. It perfects the populations ' genes so that certain species can adapt to the environmental surroundings. Because natural selection gradually changes genes, over a long time span it can make large changes, like the formation of new species (Pg. 44). All four of these forces cause variation in populations, gradually changing them over time either by random or on purpose to perfect the gene. This variation is what keeps populations changing and evolving. Without variation, no populations or species would ever improve. These four factors and the variation that they all provide are essential to changing, adapting, evolving, and improving species. Finally, speciation is the process of forming new species (Pg 46). This is possible because of the four forces of evolution occurring over long lengths of time. Certain species and populations are reproductively isolated meaning the cannot interbreed and make a new species that way. But, over time species can eventually change into a new species, it just cannot happen in one generation from parent to offspring. Isolation of the population can also prevent certain things like gene flow and random mutations from affecting another population (Pg
Natural selection in a way weeds out the less favored traits. It perfects the populations ' genes so that certain species can adapt to the environmental surroundings. Because natural selection gradually changes genes, over a long time span it can make large changes, like the formation of new species (Pg. 44). All four of these forces cause variation in populations, gradually changing them over time either by random or on purpose to perfect the gene. This variation is what keeps populations changing and evolving. Without variation, no populations or species would ever improve. These four factors and the variation that they all provide are essential to changing, adapting, evolving, and improving species. Finally, speciation is the process of forming new species (Pg 46). This is possible because of the four forces of evolution occurring over long lengths of time. Certain species and populations are reproductively isolated meaning the cannot interbreed and make a new species that way. But, over time species can eventually change into a new species, it just cannot happen in one generation from parent to offspring. Isolation of the population can also prevent certain things like gene flow and random mutations from affecting another population (Pg