2 or more tissue types work together to perform a specific function at what level?

The scenario described relates to the organization of biological systems. When two or more tissue types come together to perform a specific function, they form an organ. Each organ is made up of different types of tissues that collaborate to execute particular tasks that contribute to the functionality of the organism as a whole.

For example, the heart is an organ composed of muscle tissue, nervous tissue, and connective tissue, working together to pump blood throughout the body. At the organ level, these various tissues play distinct yet complementary roles, allowing the organ to function effectively.

The cell level refers to individual cells, which are the basic units of life. The tissue level involves groups of similar cells that perform a common function, but it is at the organ level that different tissues unite to serve a more complex purpose. Organism level refers to the entire living entity, involving all systems and organs working together. Hence, the correct answer is the organ level, as this is where multiple tissue types collaborate to perform specific physiological functions.