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.
Ecological pyramid. An energy pyramid is a presentation of the trophic levels in an ecosystem. Energy from the sun is transferred through the ecosystem by passing through various trophic levels. Roughly 10% of the energy is transferred from one trophic level to the next, thus preventing a large number of trophic levels.