Question

question 17
cell theory helps explain what it means to be a living thing. which of the following is not a principle included in modern cell theory?
all living things are composed of one or more cells.
living cells appear spontaneously from nonliving matter.
new cells are formed only by division of a preexisting cell.
the cell is the basic unit of structure and function for all organisms.

Explanation:

Modern cell theory states that all living things are made of one or more cells, new cells are formed only by division of pre - existing cells, and the cell is the basic unit of structure and function for all organisms. Spontaneous generation of living cells from non - living matter is not part of modern cell theory as it has been disproven by scientific experiments.

Answer:

Living cells appear spontaneously from nonliving matter.