As for eukaryotic cells, according to Lynn Margulis's hypothesis, they arose from what is called a symbiont relationship. ... Darwin observed that wild animals and plants showed variations just as domesticated animals and plants did. ...

• Word Count: 2685
• Approx Pages: 11
• Grade Level: High School

This "selection, which may be called Unconscious, and which results from every one trying to possess and breed from the best individual animals" will improve any species at a slow pace (Darwin 34). ... Therefore a group that shows a large amount of variation from the norm of the species, or in Darwin's terms "a well-marked variety, may be justly called an incipient," or developing species (Darwin 52). ...

• Word Count: 3127
• Approx Pages: 13
• Has Bibliography
• Grade Level: Undergraduate