The formation of the Ottoman Empire: A. triggered the downfall of the Roman Empire.
B. contributed to the downfall of the Turks.
C. began when the four sons of Genghis Khan fought over Ottoman territory.
D. began with the death of the Ilkhanate leader and his replacement by Turks.

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.

answer; recognition and measurement;