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.
These whales have strong sphincter muscles surrounding their blowhole in order to prevent water from coming in and filling their lungs, which could cause these marine mammals to drown. During deep dives the blue whale can hold its breath for up to 90 minutes before resurfacing for air, however most dives usually last less than 30 minutes.