Onion skin is a plant cell. And your skin cell is a animal cell.
Basically as simple all the structures in animal cell can be found in plant cells. But plant cells has some extra structure and part where doesn't exist in animal cells.
In animal cell, it contains a cytoplasm, nucleus and a cell membrane.
But in plant cell, they have chloroplast, cell wall and vacuole in additional.
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The cell actually divides in Cytokinesis.
Answer
cutting or incision
for example: gastrotomy means a surgical incision to the stomach
It’s the first one for sure