Abiology teacher asked his class to make models of a plant cell, an animal cell, and a bacteria cell. aside from cytoplasm and the cell membrane, which other cell structure will the students need to make for all three models?

Hello,

You will need a nucleus for the animal and plant cells, mitocondria for all three cells, and a cell wall for the plant cell. If you are needing three characteristics for all three that will include ribosomes. 

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They both determine the exact age of rocks.