Here’s the kicker: how they divide. Animal cells split by forming a tight “pinch” in the middle, like a belt tightening. This is called cytokinesis, and it’s fast and flexible.
Plant cells can’t pinch because of that stiff wall. Instead, they build a new wall right down the middle of the cell, like putting up a new drywall in your apartment. It’s slower but creates two perfect clones.
This matters for you because cancer is essentially animal cells dividing out of control. Plant cells rarely get cancer because their rigid walls keep division in check. No wonder trees live for centuries.