For A person on crutches, an incline plane is more helpful than stairs because

An inclined plane is a simple machine. An inclined plane is a ramp used to reduce the effort needed to raise or lower an object over a vertical height.

It is easier to climb stairs to get to a second floor than to climb straight up a rope. It is easier to walk up a long, gentle hill than to climb up a short, steep hill , both condition work is done by gravity which is conservative force. So work is same. But if we will take friction force then for your kind information total world done on plane will be more than stairs due to longer path of plane were against of non conservative force.  

The following are examples of inclined planes:

*  Loading ramp

* Stairs or wheelchair ramp

* Mountain road

* Threaded screw.  

The ancient Egyptians used inclined planes, or ramps, to move huge blocks of stone to build the pyramids.

there is no

explanation:

affects the water bodies: excessive use of fertilizers causes eutrophication. the fertilizers which are used on plants affect the quality of land on which it is used, further causing erosion of soil. the fertilizers used on plants contain harmful chemical fumes which affect the environment.