Which are the smallest units of life?

O cycles

DNA molecules

proteins

cells

Cells.

Explanation: In simple words cell is the basic structural and functional unit of all organisms. Cells have existed as independent units of life (unicellular organisms like various bacteria) and also form colonies or tissues and organs in higher plants and animals. The word cell is from Latin which means a small room. Which means a basic structural, functional and fundamental unit of life.

Result: Cell is the smallest unit of life.