* Animal cells are the basic building blocks of multicellular animals. An animal cell is a single unit.
* Multicellular animals are made up of many cells. The number of cells in an animal can vary greatly depending on its size and complexity. For example, a human body contains trillions of cells.
So, to answer your question:
* One animal cell contains one cell.
* An animal organism contains many cells.
Let me know if you have other questions!