if an organism requires something to perform a process, then increasing that something increases that organism's ability to perform that process & an aquatic animal is a kind of organism ->  if an aquatic animal requires something to perform a process, then increasing that something increases that aquatic animal's ability to perform that process  if an aquatic animal requires something to perform a process, then increasing that something increases that aquatic animal's ability to perform that process & an aquatic animal requires great amounts of water to thrive ->  increasing the amount of water in an environment increases aquatic animals' ability to thrive in that environment  increasing the amount of water in an environment increases aquatic animals' ability to thrive in that environment & if a species of animal is able to thrive in an environment, then the population of that animal will increase ->  as water increases in an environment , the population of aquatic animals will increase  as water increases in an environment , the population of aquatic animals will increase & an otter is a kind of aquatic animal ->  as water increases in an environment, the population of otters will increase  when a body of water receives more water than it can hold , a flood occurs & as the amount of rainfall increases in an area , the amount of available water in that area will increase ->  heavy rains cause flooding  heavy rains cause flooding & floods are a source of water ->  flooding increases the amount of water in an environment  as water increases in an environment, the population of otters will increase & flooding increases the amount of water in an environment -> a flood will cause the population of otters to increase in an environment