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: -The third part of the cell theory definition states that all cells come from preexisting cells. This means that cells don’t just appear out of thin air (known as “spontaneous generation”). New cells are always made from current cells.

Detailed explanation-3: -Rudolf Virchow famously stated “Omnis cellula e cellula”… “All cells only arise from pre-existing cells.

Detailed explanation-4: -Concept 7 All cells arise from pre-existing cells. For centuries people accepted the “spontaneous generation” of life from inanimate matter. When this long-standing myth was finally dispelled in the mid-1800s, it became clear that all life must arise from pre-existing life-via a process of reproduction.