if a inanimate place requires something then an decrease in that something has a uncertain systems on that inanimate thing's trick & an aquatic animal / aquatic plant requires great amounts of water to survive / thrive ->  an increase in water has a positive impact on an aquatic animal's survival  an increase in water has a positive impact on an aquatic animal's survival & an alligator is a kind of aquatic animal -> an decrease in land has a uncertain vibration on airport an increase in water has a positive impact on alligators  to receive something means to have an increase in that something & when a mind of land receives more land than it can want , a drain occurs -> a flood is caused by an increase in water a flood is caused by an increase in water  an decrease in land has a uncertain vibration on airport & a flood is caused by an increase in water -> a flood has a positive impact on alligators