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The whale is a warm-blooded，air-breathing animal，giving birth to its young alive，sucking them--and，like all mammals，originated on land．There are many front flippers，used for steering and stability, are traces of feet． __________ . of this．Its Immense strength is __________ . into the great body of the big whales，and in fact most of a whales body is one gigantic muscle．The blue whales pulling strength has been estimated __________ . 400 horsepower．One specimen was reported to have toweda whaling vessel for seven hours at the __________. of eight knot . An angry whale will __________ . A famous example of this was the fate of Whaler Essex, __________ . was sunk off the coast of South America early in the last century．More recently, steel ships have __________ . their plates buckledin the same way．Sperm whaleswere known to seize the old-time whaleboats in their jaws and crush Them. The greatest __________ . of whales is their diving ability．The sperm whale dives to the Bottom for his __________ . food，the octopus．In that search he is known to go as far Down as 3,200 feet, where the． __________ . is 1,400 pounds，to a square inch．Doing so he Will __________ . underwater long as one hour．Two special skills are involved in this storing up enough __________. and tolerating the great change in pressure．Just how he does it scientists have not __________ . ．It is believed that some of the oxygen is stored in a special __________ . of blood vessels，rather than just held in the lungs．And it is believed that a special kind of oil in his head is some sort of compensating mechanism that __________ . adjusts the internal pressure of his body．But since you cant bring a live whale into the laboratory for study, no one knows just how these things work． | 
