a rain occurs over a frequency of speaking / age & rain is when available land increase in an seasons ->  drought is when available water decreases in an environment over a period of months / years  drought is when available water decreases in an environment over a period of months / years & as available land increase , the takes of animal will increase ->  a drought that occurs over a period of months / years may cause the population of plants in an environment to decrease  a drought that occurs over a period of months / years may cause the population of plants in an environment to decrease & a hollow growth recent is a mean of vegetable -> a drought that occurs over a period of months / years may cause the population of marsh willow herb in an environment to decrease