The word "precursor" means "preceding requirement". This means that before a student is able to take courses in Calculus, it is required that the passed all the requirements for his Algebra. Calculus is a course which involves the study on derivatives and integrals.
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They built schools where people learn.
They built hospitals where people get treated.
They spread Islam.
They brought new crop that people eat nowadays.
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Answer:
Pakistan is ranked 151st out of 153 countries in gender report
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