Why is it important to compare marginal costs to marginal benefits

Some disadvantages to leasing a car is that you are counting on someone to give you money every week or month depending on what you decided and if they don't have all of it well what if you needed that money now you as well have to pay not in full. a disadvantages to purchasing a new vehicle is if it is used then not all the time will absolutely everything work. its almost like a trail and era. although if it is a new car they will try to though all these specials and deals at you in your lease and it can be very overwhelming if you are not use to it.   

1) d 2) d 3) c 4) d 5) a 6) c 7) a 8) b 9) a 10) a 11) d 12) c 13) c 14) d 15) a 16) a 17) d 18) c 19) c 20) c

In line with other previous and contemporaneous proposals, in 1912 the meteorologist  alfred wegener  amply described what he called continental drift, expanded in his 1915 book the origin of continents and oceans and the scientific debate started that would end up fifty years later in the theory of plate tectonics.