Predators & defenses : Many different types of animals prey on adult sea urchins, including birds, sea otters, fishes, crabs, lobsters, octopuses, and sea stars. Eggs and larvae of sea urchins are eaten by many types of carnivorous zooplankters and by suspension-feeding invertebrates including hydroids, sea anemones, and mussels, just to name a few.
IPv4 (Internet Protocol Version 4) is the fourth revision of the Internet Protocol (IP) used to to identify devices on a network through an addressing system. The Internet Protocol is designed for use in interconnected systems of packet-switched computer communication networks (see RFC:791).
List of common Internet protocols. 1  HTTP (Hypertext Transfer Protocol): allows you to share Web pages between a client and a server. 2  FTP (File Transfer Protocol) to transfer files to a server.  DNS (Domain Name System) allows to establish the link between a domain name and IP address (Internet Protocol).