Here are two links I found tonight as I was surfing the Internet! The 4th grade standard does not require you to learn all of the organelles. The major things you need to know are:
Plant cells have a cell wall on the outside of the cell to give the plant support and chloroplasts to give the plant food.
Animal cells only have a cell membrane on the outside of the cell.
Is it Plant or Animal?
Cells Alive!
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