Fifty Million Years Ago Use Natural Selection The
Read the story below. Pick one trait (body size, number of toes, or teeth) to focus on. Use natural selection theory to explain how the population changed over time. (9 pts) Keep in mind that new traits do not appear in response to new environments. You may refer to outside sources, but you may not quote other sources for this question — you must use your own words, more or less. You may write one paragraph for this question.
Remember: Natural selection does not “create” organisms “in order to” do anything. Organisms do not decide to change themselves. Individual organisms do not evolve. Changes that an organism acquires over their lifetime (more muscles, scars, stretching) do not get passed on to their offspring. If your account includes any of these elements, you will not get full credit.
The story: Fifty million years ago North American forests hostedpopulations of Eohippus (aka Hyracotherium). Eohippus were generally dog-sized, usually four-toed, and had teeth that were most suitable for eating tender leaves. One million years ago, the same region was a grassland. The descendents of Eohippus, known as Equus, still lived there, but they were very different. Equus were about cow-sized, mostly one-toed, and usually had tall teeth suitable for grinding grass.
Lecture 2.5 – anthropology and evolution: race
Lecture 3 – natural History
Lecture 4 – selection theory
If you used outside sources, insert your bibliography here.