Which of the following is formed by tissues working together?

The formation of an organ is the result of multiple types of tissues working in concert to perform a specific function. In biological terms, an organ is a collection of tissues that work together to carry out particular tasks vital for the organism’s survival and well-being. For example, the heart is an organ composed of muscle tissue, connective tissue, and other types of tissues that collectively function to pump blood throughout the body.

Cells, on the other hand, are the basic units of life and are the smallest structural units in an organism, not necessarily working together but rather functioning individually unless grouped together to form tissues. Organelles are specialized structures within cells that carry out specific functions, but they do not constitute a group of tissues. In contrast, a system consists of multiple organs working together for a common purpose, indicating a higher level of organization than an organ itself. Thus, the correct answer aligns with the biological hierarchy that defines an organ as a functional unit made up of various tissues.