How is a tissue defined in biological terms?

• A. A single cell functioning on its own
• B. A group of similar cells working together for a specific function
• C. A collection of organs performing a shared function
• D. A fluid substance within the body

Answer: (B)

A tissue is defined biologically as a group of similar cells that work together to perform a specific function. This definition emphasizes the collaborative nature of cells, where they coordinate and specialize in tasks that contribute to the overall function of an organism. Tissues are fundamental units in biology as they form the basis for the organization of multicellular organisms, allowing for the division of labor among cells and leading to increased efficiency in biological processes.

In this context, the correct answer highlights the importance of cell specialization and organization in forming tissues that can perform complex functions, such as muscle contraction or the transmission of nerve impulses. Each type of tissue—whether epithelial, connective, muscle, or nervous—has distinct roles based on the characteristics and functions of the cells that comprise them, contributing to the organ systems of the body and the overall health of an organism.

Other options do not accurately capture the definition of a tissue. A single cell does not constitute a tissue because it lacks the collective function and organization. A collection of organs describes an organ system, which is a higher level of organization than tissue. A fluid substance within the body is not a tissue type; while body fluids can be important to tissue function, they do not constitute tissues themselves. Thus, the definition that focuses