74) one difference between cancer cells and normal cells is that cancer cells; a) are unable to synthesize dna.; b) are arrested at the s phase of the cell cycle.; c) continue to divide even when they are tightly packed together.; d) cannot function properly because they are affected by density-dependent inhibition.; e) are always in the m phase of the cell cycle.

d) center of the mid-ocean ridge

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sinserly,

steckh986

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.