Which of the following is the best example of a civilization working to develop its agriculture and also protect its population? A. using crop rotation and terracing
B. planting crops and hunting
C. digging canals and levees
D. making copper and bronze tools

D  "making copper and bronze tools."

Explanation:

A. Using crop rotation and terracing

Explanation:

Crop rotation and terracing help satisfy the agricultural needs of a civilization and protect its population. Crop rotation is the practice of growing different crops sequentially in the same land and terracing is the action of preparing a soil to grow crops on it. This helps develop its agriculture and grow more crops, and it also grows food for the population to eat. These two practices help to keep the soil properties and keep growing crops for a longer time.

donald carl johanson (born june 28, 1943) is an american paleoanthropologist. he is known for discovering – with yves coppens and maurice taieb – the fossil of a female hominin australopithecine known as "lucy" in the afar triangle region of hadar, ethiopia.

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its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.