Answer:
North Africa is mostly desert. But the ancient Egyptians found that they could grow crops by irrigation ditches from the Nile River
Explanation:
Answer:
Escarpments are steep slopes and cliffsides that are caused by erosion.
The 3Rs by Russell and Burch are known to be the "alternative methods" to improve the treatment of laboratory animals, at the same time to advance the quality of science that uses animals for studies.
The 3Rs are Replacement, Reduction, and Refinement. Replacement is defined as minimizing the pain and suffering of the animals used in research. Reduction is for reducing the number of animals being used, and using healthier animals. Replacement is using alternative to animals such as tissue cultures and computer models.
