Answer: Agricultural development has the potential to improve African economies but requires extensive water supplies. These statistics from the Water Systems Analysis Group at the Institute for the Study of Earth, Oceans, and Space at the University of New Hampshire reveal the urgent need for sustainable agricultural development:
About 64 percent of Africans rely on water that is limited and highly variable;
Croplands inhabit the driest regions of Africa where some 40 percent of the irrigated land is unsustainable;
Roughly 25 percent of Africa’s population suffers from water stress;
Nearly 13 percent of the population in Africa experiences drought-related stress once each generation.
Another aspect of water-related stress is the relationship between water, soil, and agriculture. Pedro Sanchez of the Earth Institute at Columbia University says 96 percent of agriculture in Africa is rain-fed, but soil nutrient depletion is a more pressing problem than drought in sub-Saharan Africa. Development of soil nutrients as opposed to only allocation of water resources to supply agricultural production is the most effective means to relieve agricultural water stress in the long-term, Sanchez says.
Explanation:
Answer:
1. the national herotages of nepal need to be renovated built in their original structures because they need it.okay
2.they don't need to demolished it by the earthquake 2072 B.S.
3.?
4?
Answer:
Can't answer if i cant see it
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Answer:
b. killing pathogenic agents with a chemical made for that purpose.
Explanation:
Disinfection is usually carried out to kill microbial disease causing organisms. Disinfection involves using specialized chemical to kill these organisms. The substance use for disinfection is known as disinfectants. Disinfectants kills germs and infectious organisms, disinfectant are mostly used in the hospitals, kitchen, tooth surgery etc.
Pathogens are microbes that can cause disease to the body. Using disinfectants kills these pathogens . The disinfectant are usually specialized chemical for the purpose of eliminating pathogenic agents like viruses and fungi.
