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.
According to the Sea Turtle Conservancy, sea turtles can hold their breath for much longer periods of time. A sea turtle that is not engaged in strenuous activity is able to hold its breath underwater for anywhere from 4 to 7 hours. However, when a sea turtle is hibernating, it may stay underwater for several months at a time. Turtles are able to stay underwater for long periods because of their ability to metabolize oxygen at a very low rate.