In 1487 who sailed around the tip of africa

What happens in puerto rico in 2012 to celebrate the anniversary of clemente's 3000th hit

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.

Roman builders used rows of arches in there buildings to form a curved ceiling called what