Which of the following describes the Cell Theory?

The Cell Theory is a fundamental biological principle that states that all living organisms are composed of one or more cells. This concept emphasizes that cells are the basic unit of life and that all functions of living organisms occur within cells. The importance of this theory lies in its role in unifying various biological sciences under a common understanding of the cellular basis of life.

By stating that all living organisms are made up of cells, the correct answer highlights the core aspect of cell theory, which underscores that whether an organism is unicellular, like bacteria, or multicellular, like humans, cells serve as the fundamental building blocks of life. This understanding is foundational in biology and provides insight into the structure, function, and organization of living things.

Understanding this principle helps in various scientific fields, such as genetics, microbiology, and medicine, as it relates to how organisms grow, develop, and function at the cellular level.