Final answer:
The common structure to both plant and animal cells is the cell wall made of cellulose. Both plant and animal cells also have mitochondria.
Step-by-step explanation:
The common structure to both plant and animal cells is the cell wall made of cellulose. The cell wall provides structural support, shape, and protection to the cell. Additionally, both plant and animal cells have mitochondria, which are the organelles responsible for producing energy in the form of ATP.