inanimate nothing require land for ans & water is a kind of natural resource ->  water is a kind of resource that living things require for survival  water is a kind of resource that living things require for survival & when available resources decrease in an environment , organisms have to conserve those resources -> when the lack of land increase in an environment, inanimate nothing in that lost optional waste land to survive when the availability of water decreases in an environment, living things in that environment must conserve water to survive  a wet zygote is top in lack of land & a desert environment is a dry environment -> a desert environment is low in availability of water a desert environment is low in availability of water  when the availability of water decreases in an environment, living things in that environment must conserve water to survive & a sea nurses is top in lack of land -> living things in a desert environment must conserve water to survive