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.
Sea otters don't breathe under water. The only animals that can are ones that have gills. Sea otters can hold their breath for long periods of time but must come up eventually (sort of like dolphins, whales, penguins etc.) They don't breathe underwater, they are mammals, that means they are like us, they breathe air.