<u>Answer:</u>
(A) Studying algebraic equations in math.
This was made possible by contributions of Islamic civilizations
<u>Explanation:</u>
“Muslim scholars” contributed largely in the field of Mathematics in the golden age of Islamic civilization. “Arabic number system” is widely used even today.
The first great achievement was introduction of ‘’Arabic numerals’’. It explains the "place-value" theory, which allows numbers to be expressed by “nine figures” and zero. This development made calculation very simple and also paved the way for the development of a completely new division of mathematics which is “algebra”. Even Arabic words entered Western vocabulary like “Al-JABR” became “Algebra”.
In 1969, Nixon halted the dumping of toxics into the Great Lakes. Nixon was responsible for the push to develop the Environmental Protection Agency. He created the Council on Environmental Equality in 1970 and passed the Clean Air Act in 1972.
Life expectancy was next to none and much instruction wasn't required for ladies so they would remain reliant on their spouses. Life expecancy is a factual measure of the normal time a life form is relied upon to live, in light of the time of their introduction to the world, their present age and other statistic factors including sex.
Hitler killed 60-85 million people , while Stalin killed 10-20 million people.