A third level can be defined to identify a particular host server at the Internet address. In our example, www is the name of the server that handles Internet requests. (A second server might be called www2.) A third level of domain name is not required.
Sea anemones are a group of water-dwelling, predatory animals of the order Actiniaria. They are named for the anemone, a terrestrial flower.Sea anemones are classified in the phylum Cnidaria, class Anthozoa, subclass Hexacorallia. sea anemone is a sessile polyp attached at the bottom to the surface beneath it by an adhesive foot, called a basal disc, with a column-shaped body ending in an oral disc.
Sea cucumbers are cylinder, or cucumber, hence the name-shaped invertebrate animals that live in many different ranges of the ocean. They can be found from warm tropical waters to cold deep sea trenches.They are most diverse to tropical shallow-water coral reefs.any of these sea cucumbers feed on or in the sand beneath them. Reef dwelling sea cucumbers are most often suspension feeders, as currents continually bring in food. One very important feature of the sea cucumber is the calcareous ring that encircles the throat.