The rapid growth of the human population during the last two centuries is indirectly responsible for which environmental concern, that in turn, will lead to future species extinction? a). ozone depletion. b). habitat fragmentation. c). decreased biodiversity. d). fossil fuel consumption

The rapid growth of the human population during the last two centuries is indirectly responsible for which environmental concern, that in turn, will lead to future species extinction is decreased biodiversity. The correct answer C. 

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on