Special Operations Forces Center. 1  Fleet Week Jump with the Navy Leapfrogs Experience the Navy Leapfrogs' spectacular Fleet Week jump over San Francisco alongside the team, thanks to a handy helmet cam. Profile: 353d Special Operations Group The 353rd Special Operations Group is the focal point for all U.S. Air Force special operations in the U.S. Pacific theater.
Animals which Breathe through their Skin. Some animals which live on land have a skin which is so thin that gases can easily pass through it. We say that they have a permeable skin. Earthworms and amphibians have a skin which is permeable to gases. Amphibians also have a pair of simple lungs but they are not sufficient on their own for breathing. Large animals which breathe through their skin also use blood to transport oxygen to their tissues and to bring carbon dioxide to the surface of the body.
Amphibians use their skin as a secondary respiratory surface and some small terrestrial salamanders and frogs lack lungs and rely entirely on their skin. They are superficially similar to reptiles but, along with mammals and birds, reptiles are amniotes and do not require water bodies in which to breed.mphibians have a skeletal system that is structurally homologous to other tetrapods, though with a number of variations. They all have four limbs except for the legless caecilians and a few species of salamander with reduced or no limbs.