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.
Mystery of how sperm whales hold their breath for 90 minutes solved as scientists discover the key is unique protein in their blood.
Respiration. A killer whale breathes through a single blowhole on top of its head. The blowhole is relaxed in a closed position. To open the blowhole, a killer whale contracts the muscular flap covering the blowhole. A whale holds its breath below water.espiration. A killer whale breathes through a single blowhole on top of its head. The blowhole is relaxed in a closed position. To open the blowhole, a killer whale contracts the muscular flap covering the blowhole. A whale holds its breath below water.