Although the diseases transferred by columbian exchange resulted in 50 points a) a contraction of native populations in asia, the primary effect was a population boom. b) an increased population growth in africa, the long-term effect on global population was stable. c) the depopulation of the americas, the overall effect was a decreased population growth worldwide. d) the depopulation of the americas, the overall effect was an increased population growth worldwide.

I believe the answer is D

C)the depopulation of the Americas, the overall effect was a decreased population growth worldwide.is your best answer choice.

As they are "diseases" (negative effect), and that the native Americans did not have the anti-bodies to fight against the certain diseases that were brought from Europe (such as chicken-pox, for example), it led to a decrease in the population in the Americas, which affects the global population.

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i only have part a but here is the first one: - lewis and clark are born

- lewis marries sacajawea and clark is jealous  

- clark drowns lewis and then goes to jail