Answer:
for the wall of mexico it was Construction began on this section in 1990, and was complete by 1993.
Explanation: not sure what your talking bout though
They learned the earth was much older than they had previously thought.
Gradual processes changed the earth's surface.
Fossils could tell the age they came from.
Answer:
To establish laws, maintain order and provide security, protect citizens from external threats, and promote the general welfare by providing public services.
What’s the context of the question?
Answer: for number 1
Explanation:
The constant competition between the US and the USSR often made other nations into opportunities for one side to gain an advantage over the other. The Cold War also spread the worldwide fear of nuclear war, which heavily influenced international diplomacy and affairs. ...