sharks lack the gas bladder that allows bony fish to control their buoyancy precisely, for example, and instead have to rely on swimming, buoyant fatty livers and, occasionally, a gulp of air.
ishi tib evolved from bony fish in the shallow waters near the coral reefs of tibrin.
伊希提卜人由提卜林星珊瑚礁附近浅海中的骨鱼进化而来。
many primitive lineages went extinct as sharks and bony fish became masters of the waters and tetrapods, the four-legged animals that eventually evolved into dinosaurs and mammals, conquered the land.
许多原始生物灭绝,鲨鱼和硬骨鱼成为水域的主人,四足动物最终进化成了恐龙和哺乳动物,征服了陆地。
fish generally respire through gills. most bony fish es have a swim bladder a gas-filled organ used to adjust swimming depth.