Jellyfish

Jellyfish are important large-scale ocean plankton, are cnidarians. Jellyfish life is very short, with an average life of only a few months. Jellyfish are invertebrates belonging to the door of a cnidarians. The world's oceans has more than two hundred kinds of jellyfish, they are distributed in the waters around the globe. Jellyfish different shapes and sizes, the largest jellyfish tentacles can extend about ten meters away. Some belong in the classification Hydrozoa, some are Scyphozoa, its life history, almost all types have two types, namely, hydra-and jellyfish-type, and have two types in between sexual and asexual reproduction cross generations phenomenon, and we often see jellyfish, jellyfish are sexual type.