A structure that is made up of different kinds of tissues and does specific jobs is called an organ.

Here's why:

* Tissues: Groups of similar cells that work together to perform a specific function. Examples include muscle tissue, nervous tissue, connective tissue, and epithelial tissue.

* Organ: A structure composed of different tissues that work together to perform a specific function. Examples include the heart, lungs, stomach, brain, and skin.

Let me know if you'd like more examples or want to learn about the different tissue types!