A collection of cells with similar structure and function is known as what?

A collection of cells that share similar structure and function is termed "Tissue." In biological terms, tissues consist of groups of cells that work together to perform a specific function, such as muscle tissue facilitating movement or epithelial tissue covering surfaces. Tissues are one of the fundamental components of organization in multicellular organisms, bridging the gap between individual cells and more complex structures, such as organs, which are made up of multiple types of tissues working in harmony.

Other concepts like organs, organisms, and systems represent higher levels of biological organization. An organ consists of different types of tissues collaborating to execute a function—like the heart or lungs. An organism is a complete individual living entity, while a system refers to a group of related organs working together to perform complex functions, such as the circulatory or digestive system. Understanding the level of organization helps clarify the role and complexity of tissues within the broader context of biological structures.