Which statement best describes ecosystem? A. They can never change unless their established.
B They constantly change in different way's over time
C Ecosystems always revert back to their original state
D Each ecosystem can exist for only a specific length of time

answer; (a) he was a u.s senator for 38 years;

the phenomenon that would be cited as evidence of increased economic interdependence between europe and the americas is  the development of mercantilism.

this theory suggests that the wealth of a country depends on its economic assets, or capital.

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