sentences: if a living thing requires something then an increase in that something has a positive impact on that living thing's survival & 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 increase in water has a positive impact on alligators  to receive something means to have an increase in that something & when a body of water receives more water than it can hold , a flood occurs ->  a flood is caused by an increase in water  an increase in water has a positive impact on alligators & a flood is caused by an increase in water -> a flood has a positive impact on alligators