When you look at the night sky sometimes there is a full moon and sometimes the moon looks like its barely there. whydoes this happen?

because the Earths rotation and clouds are covering it

Explanation: clouds are in the way so it blocks the vision and the Earths rotation can also block out the vision of the moon

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.

the first question's answer is a.