... the earth's outer crust. By means of radioactive dating, the ages of rocks in many places on earth have been determined. It is a timetable of the earth's geologic history. This combined with the fossil record, another observation supporting the evolutionary hypothesis, has produced an apparent sequence of life forms from most simple to most complex during the history of the planet ... and food supply. He also believes in competition, where individuals of each generation compete for available food and opportunities to mate and reproduce. A third idea of Darwin's evolution theory is varia...

• Word Count: 2536
• Approx Pages: 10
• Grade Level: Undergraduate