Which most accurately describes how the tang dynasty influenced neighboring civilizations?

a. india valued the tang dynasty's social class organization and instituted a rigid caste
system.

b. korea admired the tang dynasty's government and adopted a merit-based
bureaucracy.

c. vietnam respected the tang dynasty's representative republic and instituted a direct
democracy

d. japan revered the tang dynasty's centralized government and implemented
communism.

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explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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biological/genetic factors means they were born or predisposed to have something. nothing can really change it, and you can't really do much to "fix" it. it isn't something learned

these are the biological factors:

adrian is relatively tall and he is on the basketball team

(adrian can't ever stop being tall or force himself to be tall. likely one or both of his parents are tall as well and they passed on the tall gene. he probably does basketball because he is tall)

the rest are environmental/cultural factors. these are things that are taught to us. for example, cynthia wasn't born saving pocket money, her family most likely taught her this (environmental factor)

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