what is the basic unit of structure and function of all living organisms?\no mitochondrion\no dna\no…

Brief Explanations:

Cells are the fundamental building - blocks of life. All living organisms are made up of one or more cells, which carry out all life - sustaining functions. Mitochondria are organelles within cells, DNA is the genetic material within cells, and the nucleus is a cell organelle.

Answer:

D. cell