Why has the perennial system of irrigation replaced the basin system of irrigation for farmers near the nile river?

a. the perennial system only allows the planting of one main crop.
b. the perennial system is less dependent on the nile flood and allows the planting of multiple crops.
c. the perennial system was developed thousands of years ago.
d. the perennial system is more effective in places like egypt and northern sudan.

The correct option is B

Perennial rivers have an uninterrupted flow of water throughout the year, regardless of the season, although some perennial rivers may stop flowing during a severe drought. The perennial rivers drain a large area that forms the river basin, such as the Amazon River, which covers an area of 2.7 million square miles and is the largest basin in the world. The Congo River in Africa drains an area of 1.5 million square miles, making it the second largest river basin in the world.

the term is einsatzgruppen

after the civil war, and with the termination of slavery, the south was faced with a big problem; what was supposed to happen and how they were supposed to deal with the freedom and the rights that black people and freed slaves had gained as a result of the north defeating the south and forcing the end of slavery. first, most, if not all, of the workforce of the south came from slaves and they did not have an option to replace the loss of said workforce. second, particularly in the south, people were convinced that black people were lesser, less intelligent, less capable and less smart than whites. this posed a huge problem for them. also, southerners were faced with another issue; freed slaves now had a say in how their lives would be lived and the right to politically choose the way they would be governed. people in the south did not want to accept this, none of this and this opposition and the conflicts that arose from it, not to mention the afereffects of the war, forced the congress of the time to enact and enforce the reconstruction plans that had been proposed by president andrew johnson.