Question

which of the following statements is one of the three core principles of the unified cell theory described in the text? all living things are classified as either prokaryotic or eukaryotic. new cells arise from existing cells. all cells contain a nucleus and other membrane - bound organelles. cells are the most complex unit of a living thing.

Explanation:

The unified cell theory has three core principles: all living things are made of cells, cells are the basic unit of life, and new cells arise from existing cells. The first option is about cell classification (not a core principle). The third option is incorrect as prokaryotic cells lack a nucleus. The fourth option is wrong as cells are the basic (not most complex) unit. The second option "New cells arise from existing cells" aligns with one of the core principles.

Answer:

New cells arise from existing cells.