crustaceans
Crustacean, common name for any of a group of mainly aquatic arthropod invertebrates, including the crab, lobster, and shrimp. Crustaceans are also successful in fresh water, and a few, such as sow bugs, are common in moist land environments. Although most crustaceans are small, they vary widely in form and include such large members as lobsters up to 60 cm (24 in) long and a spider crab with a leg span of 3.6 m (12 ft). The subphylum contains about 26,000 known species. Like all arthropods, crustaceans have an external skeleton (exoskeleton) and a body made up of a series of segments. Each of these segments generally bears a pair of branched limbs. In the course of evolution, the segments and other parts of the body have become specialized. The limbs, used in respiration, swimming, crawling, and feeding, may be highly modified as jaws, reproductive organs, and other structures, or they may be simplified or lost The head is usually fused with several segments behind it, forming a region called the cephalothorax, which is followed by the abdomen. Commonly an outgrowth of the head, called the carapace, covers much or even all of the body. On the head are two pairs of sensory organs (antennae) and a pair of jaws (m
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Some common words found in the essay are:
Crustaceans Crustacean, CRUSTACEANS Crustaceans, True Crabs, Spider Crab, Crustacean Lobster, Japan Crustacean, Atlantic Lobster, walking legs, Facts******** Largest, Mike Type, pair walking legs, inside body, live water, pair walking, antennae brain, head usually, crustaceans live, nerve cord, spider crab, hard shell,
Approximate Word count = 876
Approximate Pages = 4 (250 words per page double spaced)
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