Why was irrigation important to Sumer? A.)It led to the invention of the sail.
B.)It helped create food surpluses.
C.)It led to trade with other city-states.
D.)It moved water from mountains to city-states.

It helped create food surpluses

Explanation: irrigation is about crops, it's to help grow crops where they wouldn't be able to otherwise. So it would help create food surpluses if they were growing more crops.

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.