Cell is like a Train
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Nucleus: This important part if compared to a train would be the engine or the front car, because the nucleus is the "Brain" of the cell. It controls all of the activities that go on in the cell. And because the engine on the train does the same thing the two are somewhat alike.
Chromosomes: The chromosomes are compared to the building cars on the train. A chromosome contains DNA, and passes traits from one cell to the other during Mitosis. The building car will make other cars to add on to the train like the chromosomes adding more cells to your body.
Mitochondria: This part is compared to the fuel car that burns the coal to make energy for the train. The mitochondria make most of the energy for the cell. The more active the train the more coal it needs. Like the mitochondria, the more active the cell the more mitochondria it has...