Answer to 1st question: They dug irrigation systems and canals to get the water to their crops.
Answer to 2nd question: They knew how to boost the immune system and they knew how to get the body to produce more white-blood cells. They also had a 90% success rate on surgeries, including brain surgeries.
Answer to 3rd: He had a big army and long roads leading all over his empire so if there was an uprising his army could travel quickly.
Hope this helps, have a good day. c;
Carl Linnaeus developed the classification system that is currently in use .
<h3>What is Classification systems?</h3>
Classification systems serves as the grouping and organizing of data base on certain criteria so they can be compared.
Therefore, the current Classification systems base on the living things was designed in 18th century and was widely accepted till today.
Learn more about Classification systems at;
brainly.com/question/276526
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