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INTRODUCTION TO THE ANIMAL KINGDOM
The Animal kingdom is one of the six kingdoms in the world. Animals can be classified by whether or not they have a backbone. Animals with a back bone are called vertebrates. Animals without backbones are called invertebrates. Over ninety-seven percent of animals invertebrates. The animal kingdom is also classified into nine phylums. You will be reading about these phylums. The nine phylums include echinoderm, cnideria, chordata, nematoda, porifera, platyhelminthes, anellida, arthropod, and mollusks. Examples of the echinoderm are sea stars, and sea cucumbers. The echinoderm can rebuild limbs, and they have five point radial symetry. An example of cnideria is jellyfish or an anenome. Cnideria has stinging cells, and some are rock-building. An example of chordata is a human. In the chrodata phylum, they all nurse their young, and they have hair or fur. Nemotoda, platyhelmentes, and annelida are all examples of worms. An example of nemotoda is the round worm. Platyhelmentes is the flat worm and annelida is the earth worm. The nemotoda, platyhelmentes,and annelida all have bilateral symmetry. An example of porifera is a sea sponge. Porifera is the simplest phylum because they have no muscles or organs. Arthropods are another pyhyla of the animal kingdom. Examples of arthropods are beetles, lobsters, and spiders. They all have a tough outer-covering. The last phyla of the animal kingdom is mollusca. Most mollusks live in the ocean. Examples of them are snails, shrimp, and clams.