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.
What is the development of the cell theory? In seventeenth century, microscopes were improved. . Robert Hooke cut a thin slice of cork and looked at it under the microscope.To Hooke, the cork seemed to be made up of em â¦ pty little boxes,which he named cells. .