Question

the smallest unit that can perform life processes independently is called.
an organ system
an organism
tissue
an organ
a cell

Explanation:

Cells are the basic structural and functional units of life. They can carry out all life - processes such as metabolism, growth, and reproduction independently. Organ systems are made up of multiple organs, tissues are groups of similar cells, and organs are composed of different tissues. An organism can be multicellular or unicellular, but the smallest independent life - performing unit is the cell.

Answer:

E. a cell