Apart of the body that is specialized for a certain function and made of groups of tissues is called a(n) _[blank]_.

cell

organelle

organ system

organ

The answer is organ

Explanation:

An organ is defined as the set of tissues that fulfill a certain function. It is made up of different kinds of tissues such as muscles or membranes. An example is the eyes, the skin, the heart, etc. The term vital organs is used to count those organs without which one cannot live, such as the lungs or pancreas.