How are the indian ocean and the sub-saharan african trade routes similar?

Which of the following statements about this graph is accurate? world grain production has increased in every year since 1950. the amount of grain grown between 1950 and 1980 decreased. world grain production has generally increased between 1950 and 2010. more grain was grown in 1950 than in any other year.

Which of the following could be described as a conservative reaction against the ideas of the jazz age

Why did einstein write a letter to president roosevelt