Which factors led to the development of the four river valley civilizations of mesopotamia, egypt, the indus valley and china? choose all that applya. the ability to communicate widely through writingb. a nearby riverc. people doing different jobsd. the building of villages and citiese. the construction of places of worship

1. what was william harvey's discovery about the human body? @ two types of blood flowed through the veins and arteries. b four fluids existed in the body: blood, yellow bile, black bile, and phlegm. © the same blood flowed through the veins and arteries. d ancient ideas of human anatomy and bodily functions were wrong. done