The Fertile Crescent Group of answer choices followed the Nile and Euphrates rivers. extended from the Persian Gulf to the Mediterranean Sea and was the location of the first city-states in the Middle East. was the key to the Roman Empire in classical times. is sometimes considered to have extended from the Nile Valley to the Atlas Mountains. was the location of the first city-states in the Middle East and the first large-scale agricultural projects of Sub-Saharan Africa.

Explanation:

The crescent shaped region of middle East that spans across Iraq Iran, Syria, Turkey is called fertile crescent.  It was home to the earliest civilisations e.g Sumerian. It is called crescent because of the boomerang shaped area of the middle East.  Wheel, writing, irrigation and agriculture developed first  in this area.  

Earlier the region had fertile soil and salty wetlands and was home to various edible plant species.  It was around 10000 BC in the fertile crescent that the humans started to experiment with the cultivation and established permanent agricultural societies.

The term fertile crescent was coined by archaeologist James Henry in 1914.

answer; (true);

i would say b. research typically uses a variety of sources