The level of organization formed from molecules combined together to form the smallest living units in the body is called cells.

Here's a breakdown of how this works:

* Atoms are the basic building blocks of matter.

* Molecules are formed when two or more atoms bond together. Examples include water (H2O), proteins, carbohydrates, and lipids.

* Organelles are structures within cells that perform specific functions. They are made up of various molecules. Examples include the nucleus, mitochondria, and ribosomes.

* Cells are the smallest living units in the body. They are composed of organelles and other molecules working together to carry out life processes.

So, molecules come together to form organelles, and organelles combine to form cells, the basic units of life.