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Summary
The theory of evolution explains how all of the earth's species came to exist and that all living things share a common ancestor. It is any change in the heritable traits within a population across generations. In order for evolution to occur, reproduction is needed since an individual can't a evolve (a population with reproduction can). Evolution can occur five different ways. There can be the shrinking of a population, mating, mutations (a change in n organisms DNA), genetic drift (gradual loss of certain genes), and natural selection (only the best adapted to the environment survive). Out of all 5 of these types of evolution, however, only natural selection can cause adaptations to occur.
SP 3 - Planning and Carrying Out Investigations
I planned and carried out investigations when I worked on two evolutions labs on mutations and genetic drift. The purpose of the experiments was to understand how mutation and genetic drift occurs and works in real life. While experimenting I collected data which helped me answer questions about how evolution occurs.
XCC: Cause and Effect
The earth's and its organisms are always evolving whether it is visible to you or not. The cause of this change might have to do with the organism's environment. For example, think of a farmer. The farmer might use pesticides for their crops. However, he starts to notice that the pesticides aren't doing their jobs. What happened? because of the pesticides, the bugs weren't able to access their food. This caused their bodies to evolve and become immune to that pesticide. This story shows us that evolution may occur because of cause and effect.
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