Apsychological tests is said to be valid if it . measures what it is designed to measure
b. compares results against established standards of performance
c. produces the same results from one time to the next
d. allows test-takers to fully demonstrate the extent of their abilities

nasa 3

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.