Answer the following question given this paragraph: 

According to the cell theory , all living things are made up of cells, which is the structural unit of living organisms, and living cells always come from other living cells. In fact, each living thing begins life as a single cell. Some living things, such as bacteria, remain single-celled. Other living things, including plants and animals, grow and develop into many cells. Your own body is made up of an amazing 100 trillion cells! But even you—like all other living things—began life as a single cell.


Q: What is your body made up of?

 Choices:

- skin

- millions of elements

- energy

- trillions of cells

A:
trillions of cells
