churn in Business English. churnnoun [ U ] Preventing customer churn is a major concern for mobile service providers, since 20-40% of customers leave their providers in a given year. Employee churn for new hires increased by 33% for the third straight year.
For 18 months, the baby nurses while its mother is on land, or it swims underwater to suckle. When it dives, the calf closes its nose and ears to block out water. All hippos have this ability. They also have membranes that cover and protect their eyes while they are underwater.
Alligators have nostrils at the end of their snouts. This makes it easy for the alligator to breath while it is under water. All it has to do it stick the tip of it's snout into the air. During the winter alligators do this and let the top half of their body to freeze in the ice. (Britton, 1999)