When did egypt become two kingdoms?

3100BC

Two Kingdoms. Between 3900 and 3100BC, the villages up and down the Nile grew in size, wealth and power.

Explanation:

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.

which sentences ? that question is incomplete