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: -Classical cell theory contains three explanations about cells. These principles are: cells are the basic unit of life, all living things are made up of cells, and all cells come from other cells. Cells cannot spontaneously generate, or arise from non-living matter.

Detailed explanation-3: -Answer and Explanation: b. It states that bacteria and other small organisms can arise spontaneously. This statement describes the Theory of Spontaneous Generation, not Cell Theory.

Detailed explanation-4: -The generally accepted portions of the modern Cell Theory are as follows: The cell is the fundamental unit of structure and function in living things. All organisms are made up of one or more cells. Cells arise from other cells through cellular division.

Detailed explanation-5: -The Cell Theory Is a Unifying Principle of Biology The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life.