| | Sharks, Skates, and Rays Sharks, rays, and skates form a group of boneless fishes called the elasmobranchs (Elasmobranchii). There are about 800 species of elasmobranchs, of which over half (between 450 and 500 species)... Read more | Intertidal Zone The intertidal zone is a gradient that stretches between land and sea and one in which there is constant change as sea water moves with the tides, alternately submerging and... Read more | Bivalves Bivalves (Bivalvia) are a group of molluscs that include clams, scallops, oysters, mussels, razor shells, cockles, venus shells, borers, trough shells and many others (some of which have yet to... Read more | Zoology Basics Zoology is the study of animals and involves research in many aspects of animal life such as behavior, diet, evolution, classification, and distribution. | | | | Animals / Wildlife Ads | | | | More about Animals | | | | More from About.com | | | | | | Financial Emergencies An unexpected change in your financial situation can be incredibly stressful. Here's how to cope. More>
| | | | Retirement Planning Learn the top five things you need to do in order to start building a retirement nest egg. More>
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