Different kinds of tissues grouped together form which of the following?

When different kinds of tissues come together and perform a specific function, they form an organ. Tissues are groups of cells that work together to carry out particular tasks, and when multiple types of tissues combine, they create a structure that can perform more complex functions necessary for the survival of an organism. For example, the stomach is an organ composed of various tissues including muscle tissue that allows it to contract, connective tissue that provides structure, and epithelial tissue that lines the stomach and secretes digestive juices. This organized structure with specialized functions exemplifies what an organ is.

The other options, while related to biological organization, do not represent the grouping of different types of tissues in the same way. A cell is the smallest unit of life, tissue refers to a group of similar cells that perform a specific function, and a system is a larger organization made up of multiple organs that work together to perform complex functions within an organism. These distinctions help clarify the hierarchical structure within biological systems.