Knowing that choices have consequences, why did early civilizations develop along river valleys?

a)nomadic tribes could use rivers to trade with others
b)river valleys were fertile places where agriculture could thrive
c)papyrus plants used to make paper grew near rivers
d)none of the above

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on

he is known for discovering   the fossil of a female hominin australopithecine   known as "lucy" in the afar triangle region of hadar, ethiopia.

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the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation