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).
Internet Protocol (IP) defines how computers communicate over a network. IPv4 contains just over 4 billion unique IP addresses, which were completely allocated to specific geographic regions on February 3, 2011. As the Internet transitions, organizations must adopt IPv6 to support future business continuity, growth, and global expansion.