Answer:
480 million years ago
The Appalachians first formed roughly 480 million years ago during the Ordovician Period, and once reached elevations similar to those of the Alps and the Rocky Mountains before they were eroded.
Explanation:
so b is your answer
<span>The major dilemma regarding limited government that was discussed during the ratification debates involved the balance between the ability of a government to do harm to its people and to help its people. More specifically, founders were concerned that a government too weak to do harm to citizens would also be too weak to do good for its citizens.</span>
<span>Experiments</span>
An experimental research entails a
controlled test of a cause-and-effect relationship that researchers suspect
exists. Experiments involve a researcher directly controlling or manipulating
changes in the independent variable by exposing participants to the treatment
conditions. It is undertaken to make a discovery or test a hypothesis
