Here's why:

* All living things are made of cells: Cells are the fundamental units of life, and every part of your body is composed of one or more types of cells.

* Cells perform essential functions: Each cell carries out specific tasks to keep you alive, like generating energy, producing proteins, and communicating with other cells.

* Cells come together to form tissues and organs: Groups of similar cells work together to form tissues, which in turn create organs.

While cells are the most basic building blocks, there are smaller components within them, like molecules and atoms. However, cells are the smallest unit that can be considered truly alive and capable of independent function.