Why valley and basins more fertile than hills and mountains?​

They are very fertile because the rivers continually carry fresh sediment and soil to the region. ... Basins are areas of low elevation where rivers drain. Foothills represent a transition area between plains and mountains. Marshes and Swamps are highly vegetated, wet, lowlands.

Explanation:

thats why

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.

nigger, that word was originated for white folks   to keep black people under

and when black people use it, they know that's just how they greet each other

and when white folks use it, they know there's a double meaning under