Why did the earliest civilizations appear in areas like mesopotamia and the indus valley?     a. because these areas had the most domesticated animalsb. because these areas were isolated from other regionsc. because these areas were far away from oceansd. because these areas were near rivers and fertile soil

The earliest civilizations appear in areas like Mesopotamia and the Indus Valley "because these areas were near rivers and fertile soil."

Therefore, in this case, the correct answer is option D "because these areas were near rivers and fertile soil."

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first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

answer; basic psychology;