Which early civilization had a well organized unified empire with an elaborate system of roads covering more than 10,000 miles?

Incas is the correct answer.

Explanation:

Inca Empire existed in modern day Peru and was largest empire in pre-columbian America. It was established by Manco Capac in 1438, it  extended from Quito to Santiago and covered areas of at least 2 million kilometres. Quechua was their official language. One major characteristic of the Incas was that they had constructed more than 30,000 kilometres of roads. Inca civilisation ended in 1532 with the arrival of Conquistadors. They had strong belief in life after death.

wood carving remains today the primary sculptural art form of the sub saharan continent. african art history shows the earliest wooden sculptures from the 17th c are attributed to the kuba, central zaire but the earliest surviving sub-saharan sculpture is a zoomorphic head found in 1928 in central angola.

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i discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation: