AP BIOLOGY

Detailed explanation-1: -Scientists once thought that life spontaneously arose from nonliving things. Thanks to experimentation and the invention of the microscope, it is now known that life comes from preexisting life and that cells come from preexisting cells.

Detailed explanation-2: -Cell theory also states that cells are the basic functional unit of living organisms and that all cells come from other cells.

Detailed explanation-3: -New cells are created from existing cells through a process referred to as the cell cycle. One cell can make a copy of itself and form two new daughter cells. There are two major tasks that have to happen every cell cycle. First, cells have to make an exact copy of their DNA.

Detailed explanation-4: -All cells come from preexisting cells created through the process of cell division.

Detailed explanation-5: -Based on this realization, Virchow proposed that living cells arise only from other living cells. The ideas of all three scientists-Schwann, Schleiden, and Virchow-led to cell theory, which is one of the fundamental theories unifying all of biology.