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 Turtles. Scientists have studied breath-holding behaviors in sea turtles more thoroughly than in freshwater turtles. The leatherback sea turtle (Dermochelys coriacea), a species that frequents cold waters, holds the record for holding its breath -- just over seven hours spent underwater. While the biology of sea turtles differs greatly from freshwater turtles, it's possible freshwater turtles are capable of similar feats, even at high temperatures.