Sharks have been around for a long time, making them evolutionarily successful. Over millions of years of evolution, these marine monsters have developed a wide range of reproductive adaptations. The oviparous form of reproduction, or egg-laying, is considered a primitive form and common for

When raised on land, a primitive, air-breathing fish walks much better than its water-raised comrades, according to a new study. The landlubbers even undergo skeletal changes that improve their locomotion. The work may provide clues to how the first swimmers adapted to terrestrial life.    The