As the moisture decreases, what happens to the amount of vegetation in an area

As the moisture decreases, what happens to the amount of vegetation in an area is that it also decreases.
So, the more humidity there is, the more the plants are going to thrive and prosper, and the more of them there will be. However, if the weather is quite dry, there will be less vegetation. Take rainforests and deserts as your example: there is a lot of vegetation in rainforests, but not much in deserts.

El nino is a weather phenomenon caused when warm water from the western pacific ocean flows eastward. part1baan average of 7.7 hurricanes and 3.6 major hurricanes compares to 5 hurricanes and 1.5 major hurricanes from 1995-2005