Which of the following best describes the columbian exchange?
the letters columbus and other conquistadors exchanged with the spanish crown
an exchange of plants, animals, and diseases between europe and the americas
a form of trade between the spanish and natives
the way in which explorers exchanged information about new lands to conquer

The correct answer is B. An exchange of plants, animals, and diseases between Europe and the Americas

Explanation:

In history, the Columbian Exchange or Columbian interchange refers to the process of transfer of different elements including animals, plants, diseases, population and technology between South and Central America and Europe with the arrival of Spanish settlers to America and later the transfer between both zones with Africa caused by the use of slaver that were taken from West Africa. This exchange or interchange had important cultural effects on the parties involved but also implied negative consequences such as the introduction of invasive species and the diseases that killed many people but mainly indigenous people that lived in South and Central America. Considering this, the statement that best describes the Columbian exchanged is "an exchange of plants, animals, and diseases between Europe and the Americas".

in the united states, the president is controlled by the

constitution, and in all respects subordinate to it. insofar

as it deals with presidential power, however, the american

constitution has proved to be a highly malleable document.

with very few exceptions,' the constitutional provisions relating to the president have not been changed at all since

they were ratified in 1787. but in the late twentieth century, those provisions do not mean what they meant in

1787. the constitution is a legal document, and it is enforced judicially; but its meaning was hardly fixed when it

was ratified. in particular, the contemporary president has

far broader powers than the original constitution contemplated. it is remarkable but true that large-scale changes in

the authority of the president have been brought about

without changes in the constitutional text, but nevertheless

without significant illegality.

this is a paradox. is it not clear that constitutional

changes, if not textual, are illegal? the paradox has considerable relevance to our current thinking about the presidency in particular and about constitutionalism in general.

perhaps the framers of the american constitution feared

legislative power most of all; 2 but from well-known events

in the twentieth century, it is possible to conclude that it is

presidential power that holds out the greatest risks to both

liberty and democracy. the president is by far the most visible leader in the nation; he is often the only person in government with a national constituency. moreover, he is