Dale is trying to buy a dr. pepper from a vending machine. when he pushes the button nothing happens. dale pushes the button multiple times over the course of the next thirty seconds before accepting that it does not work. later, dale still does not want to give up on his dr. pepper. he remembers that one time he held the button down for ten seconds, which resulted in him getting his drink. he decides to try this. this is an example of

this is an example of operant variability.

Explanation:

Operant variability means that results of an operation may vary so responses are sometimes easy to predict, at other times responding seems highly variable, unpredictable, or even random. The inability to predict is generally attributed to ignorance of controlling variables.

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.

your answer would b. the missisipi river

hope i you : )