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).
IP - Internet Protocol. Developed during the 1970s, Internet Protocol (IP) is the fundamental network protocol used across the Internet, home networks and business networks. Internet Protocol is often used together with the Transport Control Protocol (TCP) and referred to interchangeably as both IP and TCP/IP.