helped the Aztec farm more productive - chinampas
helped the Inca travel long distances and communicate with their neighbors - rope bridges
helped the Maya view astronomical phenomena such as eclipses with the naked eye - pyramaid at Chichen Itza
To separate<span> the substances in a </span>compound<span>, a chemical reaction is required. Running electric current through water will produce hydrogen and oxygen gases. This process is called electrolysis. Substances in mixtures can be separated using physical change processes.</span>
Answer:
Explanation:
Great Britain, which had an increasing population that was estimated to be about 5.5 million people
1st one 3rd one and last one
<span>Eisenhower Doctrine, (Jan. 5, 1957), in the Cold War period after world War II, U.S. foreign-policy pronouncement by President Dwight
D.Eisenhower promising military or economic aid to any Middle Eastern country needing help in resisting communist aggression.</span>
