Question

what is the smallest structure that can carry out all the functions that are required for life?
a single atom
a group of molecules
a group of cells
a single cell

Explanation:

Cells are the basic unit of life. A single - celled organism can perform all life - functions like metabolism, growth, and reproduction. Atoms and molecules are components of cells but cannot perform all life - functions on their own. A group of cells is more complex than a single cell.

Answer:

D. a single cell