if a living thing requires something then that something has a positive impact on that living thing & a living things require water for survival ->  water has a positive impact on a living thing's survival  water has a positive impact on a living thing's survival & increasing the availability of something that has a positive impact on a living thing's survivial can have a positive impact on that living thing's survival ->  increasing the availability of water for a living thing has a positive impact on that living thing's survival  increasing the availability of water for a living thing has a positive impact on that living thing's survival & storing something is a kind of method for increasing the availability of something ->  storing water has a positive impact on a living thing's survival by increasing the availability of water  as dryness increases in an environment , the available water in that environment will decrease & dry means low in amount of water ->  a dry environment is low in availability of water  storing water has a positive impact on a living thing's survival by increasing the availability of water & a dry environment is low in availability of water ->  storing water increases the water available to organisms in a dry environment  storing water increases the water available to organisms in a dry environment & adapting is when a living thing responds to a change in an environment -> storing water is an adaptation to a dry environment