Cancer cells are * 1)mutated cells inherited from a parent
2)mutated cells that occur by chance
3)cells that divide more than 30 rounds of cell division
4)all of the above

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The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?