Carbon dioxide exists naturally in the atmosphere as a result of the earth's carbon cycle. It is also there as a result of man's activities in burning fossil fuels (coal, oil â¦ and natural gas), which releases long-stored carbon dioxide to add to the greenhouse gases already there.
Credit for developing cell theory is usually given to three scientists: Theodor Schwann, Matthias Jakob Schleiden, and Rudolf Virchow. In 1839. I found this answer on examvillâ¦e.com, helped me complete my homework assignment.
Cell Theory and the Development. of the Microscope Jean Baptiste Van Helmont Jean helped improve Athanasius Kiercher's theory of spontaneous generation. He still agreed that all living organisms come from abiotic or non-living factors; however, he did even further experimenting to proove spontaneous generation.