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.
Fortunately, hippos can nurse from their mothers either on land or underwater. They do this underwater by closing their valve-like ears and nostrils. Despite their size, hippos are actually quite efficient underwater. They can hold their breath below the surface for up to five minutes. When hippos are exposed to the sun, their skin actually produces an oily red substance, serving as moisturizer and sun repellant for their skin.