The best answer is A. The purpose of the cell wall is to hold the cell in a specific shape, usually rectangular or square. For example, a plant cell's wall keeps it rigid so that the plant can stand up.
If the cell does not have a wall, it can easily change shape to accommodate for things coming in and out of the cell.
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A. Duplication is one of the different types of chromosomal mutations.
A substance that releases Hydroxyl Ions in water is called a Base
I don't understand its not my language I would like to help but I can't
