The Great Wall of China was built to keep invaders from the north out. This is an example of

what are the events?

this statement is true.

forests are public goods, available for everybody. when usage of such a good becomes interesting for consumers and its usage increases, there can be a risk of overexploitation. it is a non rival good therefore, if one person consumes the good it does not reduce the availability for subsequent consumers.

these caracteristics require the establishment of measures in order to prevent the destruction of a commonly owned space, for example, to restrict the amount of people that have access to the same time.

probably 3 since archeologists and historians don’t understand there writing.

the first question's answer is a.