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AMAZING BIOLOGICAL STRUCTURES

                                     [1] THE BLUBBER OF MARINE MAMMALS          For decades, scientists could not understand how dolphins could swim at the speed of nearly 40 kilometers an hour. The animals simply did not have enough muscle, the scientists thought. But dolphins have a secret, part of which lies in their blubber, a complex substance also found under the skin of porpoises, whales, and other marine animals           Blubber is a thick, dense layer of highly organized connective tissue with a lot of fat cells. It covers practically the whole creature, and it is strongly attached to the musculature and skeleton by highly organized, fan-shaped networks of tendons and ligament. These networks, in turns, are composed of elastic fibers and collagen, a protein that is also found in skin and bones. Blubber, therefore, is much more than a layer of insulating fat. It is a highly sophisticated combination of various living tissues.         How, though, does blubber hel