Answer;
Unlike animal cells (such as cheek cells) the cell wall of an onion and other plants are made up of cellulose, which protects the cell and maintains its shape.
Explanation;
-The main structural differences between plant and animal cells lie in a few additional structures found in plant cells. These structures include: chloroplasts, the cell wall, and vacuoles.
-Plants cells have cell walls and other structures that differ from those of animals. Animal cells do not have cell walls and have different structures than plant cells. Plants have either no or very basic ability to sense.