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.
He helped the cell theory by stating an idea which was: no body can have life unless its constitute parts are cellular tissue or consist of cellular tissue.. Lorenz Oken. Lorenz Oken belived in the cell theory, but he had his own take on it.