Answer Wiki. Sand sharks a/k/a sand tiger, grey nurse and ragged tooth. Their name reportedly comes from their habit of hanging out near the shoreline, trolling the ocean floor where the waves break close to the beach. While they're considered relatively docile and mind their own business, they apparently will attack a human if provoked.
Contemporary energy transitions differ in terms of motivation and objectives, drivers and governance. In a more narrow sense, a sustainable energy transition is the shift by some countries, most notably Germany (German: Energiewende), to decentralised renewable energy, and energy efficiency.
Iron has the largest binding energy per nucleon) generally releases energy (an exothermic process), while a fusion producing nuclei heavier than iron will result in energy retained by the resulting nucleons and the reaction is endothermic. The opposite is true for the reverse process, nuclear fission.