Luke is observing a cell under a microscope. He notices a regular, rectangular shape and a thick outer layer. Which part is responsible for giving the cell this fixed shape?
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Worked Solution
Step 1: Plant cells have a cell wall; animal cells do not.
Step 2: The cell wall is a stiff, thick layer that provides support and a fixed shape.
Step 3: This explains the regular rectangular appearance.
Correct answer: Cell wall
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