21. According to the data in this chart, which two food plants were introduced to the Americas as part of the Columbian Exchange?

A. Corn and squash

B. Tobacco and coffee

C. Horses and rice

D. Oats and wheat

If anyone has done this test or knows this answer please help, I attached a photo

c) troops march forward in close formation against newer, more accurate weapons

the effects of the french revolution had a major impact on france and europe, which influenced and transformed these countries. about.com explains that the effects of the french revolution resulted in an established democratic institution, elections, constitutions and a modern government. these effects changed laws and the hierarchy of power.

according to about.com, the long-term effects of the french revolution were profound on humanity and society. the effects of the french revolution secured political and economic gains for the lower class. the french revolution shaped politics, religion and beliefs. it developed liberalism and eliminated traditional laws. the effects included counter-reaction tactics, which defeated napoleon and produced totalitarianism ideals.

the british invasion was also known as "english wave", was the predominant musical trend in the united states in the mid-60s, when numerous groups ofss rock & roll that were originally from the united kingdom, reached high levels of popularity beginning with the success of the beatles in north america. all these groups, clearly influenced by rock & roll, blues and american rhythm & blues, were able to elaborate simple songs

and catchy. in the middle of 1962 the rolling stones began like one of a series of groups that show more and more influence, along with bands like the animals and the yardbirds. in 1963, the beatles and other rhythm groups, such as the hollies, had achieved great popularity and commercial success in britain itself. the british rock received a pass to the popularity of musical currents in the united states in january 1964 with the success "i want to hold your hand" ranked number 1 on the billboard hot 100 list, beginning the british invasion of the music list of the united states.

also musical genres influenced by african rhythms such as soul, began to have popularity.

many of the best musicians in history are english: the beatles, queen, pink floyd, bowie, the smiths, led zeppelin.

false articles of confederation, ultimately building a new government and new constitution with an executive, legislative, and judicial branch and a system of checks and balances.