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 desert tortoise is a medium-sized species of tortoise that is found in the south-western desert regions of Northern America, and parts of northern Mexico. The desert tortoise is most commonly known for its high, patterned shell and the fact that is lives in burrows underground.
The desert tortoise is found inhabiting the vast sandy plains and rocky foothills that are in and surround both the Mojave and Sonoran deserts. When temperatures get too high for the desert tortoise it simply digs itself a burrow into the sand where it can remain cool until the heat dies down.
The desert tortoise has a number of biological adaptations that enable the desert tortoise to survive more suc
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Bull sharks are mainly found in the warmer and shallower coastal waters of the southern hemisphere. The bull shark is one of the most common species of shark found worldwide.
The bull shark is able to inhabit both salt and freshwater sources just as happily, with one bull shark known to have swum 4,000 km up the Amazon River in South America, finally ending up in the mountainous Peru.
The bull shark is well known for its unpredictable and aggressive temperament and is thought to be one of the most dangerous sharks towards humans. This is probably because the bull inhabits coastal waters and rivers and is therefore more likely to come into contact with swimmers and water sports en
