Which best describes the columbian exchange?

a.
the discovery of the americas by christopher columbus

b.
the transfer of peoples, diseases, plants, and animals between the new and old worlds

c.
the conversion of native peoples to christianity by spanish friars

d.
the rate at which european currencies were traded for local american products

the transfer of people's, diseases. plants, and animals between the New and Old Worlds

richard milhous nixon (january 9, 1913 – april 22, 1994) was the 37th president of the united states, serving from 1969 to 1974, when he became the only president to resign (quit). he is also known for corruption and the watergate scandal which resulted in the public losing trust in him and his resignation.

hi, according to my research the answer to the first question would be false. al tabari was the author of the first medical encyclopedia & he was a persian scholar not arab