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http://www.bing.com/images/search?q=images+of+aristotle&id=726701ADB62FB1D16D14333CF306D74F78E05942&FORM=IQFRBA#a Aristotle's major biological works, including On the Generation of Animals, raised fundamental questions about reproduction, development, and heredity. By recognizing the value of studying organisms , Aristotle started an approach to philosophy and biology.
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http://www.timetoast.com/timelines/cell-theory-and-discovery-of-the-microscope--5 Jean Baptiste Van Helmont was the first to question the theory of Spontaneous generation. He considered that things like sulfur, salt, and mercury were created through chemical processes rather than being preexistent.
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LINKZacharias Janssen was associated with the invention of the first optical telescope. Janssen was also credited for inventing first truly compound microscope
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http://www.bing.com/images/search?q=images+of+Robert+Hooke&go=&qs=bs&form=QBIR#view=detail&id=917A4533F66E9398CB74455138297A1BD7407AF8&selectedIndex=2Robert Hooke gave name to cells. Scientist had alot of questions regarding this event.
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http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm
In 1678, Antoni van Leeuwenhook reported that he had observed "little animals"protozo a through a microscope. -
http://www.bing.com/images/search?q=images+of+lorenz+oken&id=F99AF5AD378C46DA7BEECFB95FBCF0046C4ABABD&FORM=IQFRBA#view=detail&id=F99AF5AD378C46DA7BEECFB95FBCF0046C4ABABD&selectedIndex=0 Lorenz Oken belived in the cell theory, but he had his own take on it. He believed that there were tiny units of life called infusoria that make up the human skin, bones, and organs. Oken's very similar, but different at the same time helped spread the cell theory.
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http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm extended the work of Schleiden and Schwann by proposing that all living cells must rise from pre-existing cells. This was a radical idea at the time because most people, scientists included, believed that nonliving matter could spontaneously generate living tissue.
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http://www.bing.com/images/search?q=images+of+matthias+jakob+schleiden&FORM=AWIR#view=detail&id=AE79140755714DAE88E8674BB102B0784B796E41&selectedIndex=0 Preferred to study plant structure under the microscope.Stated that the different parts of the plant organism are composed of cells or derivatives of cells. Thus, Schleiden became the first to formulate what was then an informal belief as a principle of biology equal.
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http://www.britannica.com/EBchecked/topic/528563/Theodor-Schwann#ref164307 Worked at the University of Jena and advanced the cell theory for plantsthen he extended to animals.
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http://bitesizebio.com/articles/history-of-cell-biology/ descirbed mitochondria.
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http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm set out to disprove spontaneous generation with a now-classic experiment that both firmly established the cell theory beyond doubt and solidified the basic steps of the modern scientific method.
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Scottish botanist, discovered the presence of nuclei wihtin a cell
