The coolest thing about Biology

The coolest thing about is the endosymbiosis theory. The endosymbiosis theory is the idea that the mitochondria was originally another another cell. This cell then moved into the cell membrane of one cell for a unknown reason, and this formed a symbiotic relationship. Both cells benefited, and eventually they both coevolved with each other until one became part of the other. This also applies some other organelles, such as chloroplasts in plants! Below is a diagram that shows how endosymbiosis happened.


Image Source:

Endosymbiotic Theory. (2013, August 11). Wikipedia. Retrieved November 1, 2013, from http://en.wikipedia.org/wiki/Endosymbiotic_theory