Corals are marine invertebrates in the class Anthozoa of phylum Cnidaria. They typically live in compact colonies of many identical individual polyps. The group includes the important reef builders that inhabit tropical oceans and secrete calcium carbonate to form a hard skeleton.
A coral "group" is a colony of myriad genetically identical polyps. Each polyp is a sac-like animal typically only a few millimeters in diameter and a few centimeters in length. A set of tentacles surround a central mouth opening. An exoskeleton is excreted near the base. Over many generations, the colony thus creates a large skeleton that is characteristic of the species. Individual heads grow by asexual rep
The woolly mammoth was an enormous mammal that once roamed the vast frozen, northern landscapes in large size. Believed to be closely related to the modern-day elephant, the woolly mammoth remained in the wild until roughly 1700 BC when it became extinct.
The woolly mammoth was found roaming the bitter Arctic tundra where they would often gather in large herds for both warmth and protection. Woolly mammoths lived in two groups which are thought to have been different enough to be characterized as separate subspecies. One woolly mammoth group stayed in the middle of the high Arctic, while the other woolly mammoth group had a much wider range.
The woolly mammoth was an enormous ani
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The horn shark is a small species of shark, natively found in the coastal waters of north-west North America. The horn shark is named for the broad, flattened head and high ridge found behind this shark's large eyes that is almost horn-like in appearance and makes this shark one of the hardiest of all shark species.
The horn shark is endemic to the Pacific north-east, and is only found in the warmer waters off the coast of California. The horn shark is most commonly found along the temperate to sub-tropical continental shelves where it spends most of it's time in search of hard-shelled marine organisms to eat off the sea-bed.
The horn shark is a small species of shark that typic
