What is the correct order of multicellular organization from smallest to largest?

The correct order of multicellular organization from smallest to largest is indeed Cells, Tissues, Organs, and Organism. This hierarchy illustrates the complexity and organization within biological systems.

Starting with cells, they are the basic units of life and the smallest level of organization. Each type of cell performs specialized tasks that contribute to the function of the organism. When groups of similar cells come together, they form tissues, which serve specific functions. For instance, muscle tissue is composed of muscle cells and is responsible for movement.

Tissues then combine to create organs, such as the heart or lung, each composed of multiple tissue types working together to perform complex functions necessary for the organism's survival. Finally, various organs collaborate within organ systems (e.g., the circulatory system), and when all systems work together, they form the complete organism.

This organization shows how biological systems are structured through increasing complexity, beginning with individual cells and culminating in the full organism, allowing for efficient functioning and interaction with the environment.