The physical activity guidelines for americans recommend: a) specific amounts of only aerobic physical activity. b) only vigorous-intensity physical activity as beneficial. c) spending the same amount of time each day on activity. d) accumulating activities in weekly totals of at least 10-minute sessions.

A

Explanation:

Specific amounts of only aerobic physical activity in order to maintain regularity.

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.