What defines a tissue in biological terms?

In biological terms, a tissue is defined as a collection of similar cells that work together to carry out a specific function or set of functions. This definition emphasizes the importance of both the similarity of the cells and their collective role within a living organism. Tissues are the next level of organization after cells, and they combine to form organs and ultimately systems within an organism.

The other options do not accurately define tissue: a single type of specialized cell refers to a cell rather than a group, a large organ structure involves multiple tissues and is not solely about the grouping of cells, and a collection of different cell types describes an organ or a complex structure rather than a uniform tissue. Thus, the definition focusing on similar cells serving a common purpose aligns perfectly with the fundamental concept of biological tissue.