The Evolution of Cell Theory Since the beginning of humanity, science has been a developing subject full of mysteries and questions. These questions could be as small as why closet doors close more easily during the winter than in the summer, and as large as how the universe was created. There are numerous scientific topics such as chemistry, biology, and physics, each of which has its own questions to answer. They each have their own theories that have developed since they started; but what is a theory? Well, according to the Merriam-Webster's Dictionary, a theory is "an idea or set of ideas intended to explain facts or events." Theories are a way to provide a direct explanation for a broad topic. Without theories, humanity would have to continue to explain a question without having an explanation for things related to it. However, theories are not just about science. There are mathematical, musical, and theories for practically every subject in this world. Keep in mind that a theory is not a law. For example, a famous scientific theory that most people have heard of is the Big Bang theory. This theory is an effort to explain what happened at the beginning of our universe; however, this theory explains other theories which in turn explain other theories forming a huge chain of theories that become more specific as you go down the chain. The key word is an effort to explain something. Theories are constantly developing and never stop until everything has been overlooked. Another famous theory comes under the scientific topic of Biology; the cell theory. This theory refers to the idea that cells are the basic unit of structure of all living things, and confirms this with three additional... halves of the card... above the nucleus. After all these discoveries, Henri Dutrochet finally intervenes and establishes the definitive connection between animal and plant cells. He stated that the cell was not only structural, but also a physiological unit; "It is clear that it constitutes the fundamental unit of the organized state; in fact, everything ultimately derives from the cell," Henri said. Durtrochet also proposed that new cells came from old cells, a view already affirmed by Francois Raspail.Works Citedhttp://www.science-of-aging.com/timelines/hooke-history-cell-discovery.php http:/ / www.xtimeline.com/evt/view.aspx?id=366449 http://www.smithlifescience.com/celltheory.htm http://www.cpschools.com/Schools/OSM/theory.htm http:// www .brighthub.com/science/genetics/articles/23805.aspxhttp://www.biologyreference.com/Gr-Hi/History-of-Biology-Cell-Theory-and-Cell-Structure.html