You're correct! It's a fundamental principle of biology that all living things, including animals, are made up of cells. This is known as the cell theory.

Here's a breakdown:

* Cell Theory: This theory states that:

* All living organisms are composed of one or more cells.

* The cell is the basic unit of structure and organization in organisms.

* All cells arise from pre-existing cells.

* Animals and Cells: Animals are multicellular organisms, meaning they are made up of many different types of cells that work together. These cells are organized into tissues, organs, and organ systems to carry out all the functions necessary for life.

Let me know if you have any other questions about cells or animals!