How did the differences between plebeians and patricians prevent rome from becoming a true democracy?

Some wealthy Patricians and Plebeians families got together and made a new ruling class that took over the political officers and Rome never became a Democracy. 
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Answer the zagros mountains, stretch across western iran and are located next to the khuzestan plain; answer( zagros mountains

Answer(apex)  ok i looked up two diff, sites both say the answer is a technological innovation that has allowed people to adapt to living in hot climates, plz check first good luck///