Became suitable sites for new civilizations like mesopotamia because they provided arable land and sources for irrigation. a. coastal plains b. mountainous regions c. tropical forests d. river valleys

D. It's because river valleys provided the Mesopotamians a better way to get irrigation and water supplies. In fact, it made their means of getting those way easy so then they will be able to fully grow crops without any worry thanks to the natural supply near their area.

Here is a picture  of the net. its 4 squares in a row diagonal and on the third draw one square aove and under

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