Answer:b. Bartolomeu Dias
Explanation:
While Russia holds periodic elections and her leaders get into office through popular mandate,the process itself is not fair and credible,despite it being free.
The Russian government led by Putin has a history of silencing dissent voices, and curtailing of fundamental freedoms of a democracy such as free speech,free press and freedom of association.
Mayan architects used available materials that were local to them like limestone and sandstone which were found in Palenque and Tikal.
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15 slave and 15 free states.
the two factors are inertia and gravity