Plz help Ahmed has to write a five-minute speech on ways to protect the environment for his social studies class. He has to deliver this to his sixth-grade classmates. Which of the following topics is the best because it is specific and appropriate for his audience?
A.
a detailed design and working of waste-disposal and recycling systems
B.
the United Nations' survey of recycling programs around the world
C.
a history of recycling programs and their success in the United States
D.
how recycling, especially at the school level, can help the environment

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the columbian exchange, also known as the columbian interchange, named for christopher columbus, was the widespread transfer of plants, animals, culture, human populations, technology, and ideas between the americas, west africa, and the old world in the 15th and 16th centuries, related to european colonization and trade following christopher columbus's 1492 voyage. invasive species, including communicable diseases, were a byproduct of the exchange. the changes in agriculture significantly altered and changed global populations. the most significant immediate impact of the columbian exchange was the cultural exchanges and the transfer of people between continents.

the new contact between the global population circulated a wide variety of crops and livestock, which supported increases in population in both hemispheres, although diseases initially caused precipitous declines in the numbers of indigenous peoples of the americas. traders returned to europe with maize, potatoes, and tomatoes, which became very important crops in europe by the 18th century.

the term was first used in 1972 by american historian alfred w. crosby in his environmental history book the columbian exchange. it was rapidly adopted by other historians and journalists and has become widely known.