The Canadian dollar (symbol : $ ; code: CAD) is the currency of Canada. It is abbreviated with the dollar sign $ , or sometimes C$ to distinguish it from other dollar-denominated currencies. It is divided into 100 cents.
14. View. comments. The sperm whale is able to hold its breath underwater for up to 90 minutes because of a unique protein in its blood, an international team of scientists has discovered. The huge mammal will often dive up to 3km deep under water for more than an hour in search of food.
Whales even have eyes that can see in monochrome, which is especially valuable deep beneath the surface where sunlight is at a premium. But one of the whales' more fascinating adaptations is their enviable ability to hold their breath underwater for up to an hour at a time. Scientists know it has something to do with their myoglobin, a molecule in the blood that helps the body's muscles retain oxygen.