When is a system of currency exchange most likely to be used? A.
when one country trades goods with other countries
B.
when one country signs treaties with other countries
C.
when one country regulates trade between other countries
D.
when one country regulates banks in other countries

when one country trades goods with other counties.

more than 1 person for sure

the language of nature was a manifestation from god as he said "let there be light" and there was light the world began to assume visible, comprehensible form.

what ever we know now think of the old vision of creation we can be sure that with out the speaking of word -without language- we would have no science today with its striking power to illuminate the world.