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Amoeba: Any of various one-celled aquatic or parasitic protozoans of the genus Amoeba or related genera, having no definite form and consisting of a mass of protoplasm containing one or more nuclei surrounded by a flexible outer membrane. It moves by means of pseudopods. Ectoderm: The outermost layer of cells on the body of an organism. Spicule: a branched needle of either calcium carbonate or silica that supports the bodies of some sponges Scolex: A knob-shaped part at the end of a tapeworm that produces proglottids. Ganglion: A group of cell bodies of the neurons of a nerve. Pharynx: In planarians, a muscular tube on the ventral surface, connected by its anterior end to the gastrovascular cavity; in most other animals, a tubular structure that connects the mouth with the esophagus. Osculum: The mouthlike opening in a sponge, used to expel water. Cephalization: The concentration of sensory organs and nirvous tissues at the anterior, head end, of the body. Heterotroph: An organism that feeds on the organic compounds of other organisms Platyhelminthes: any of a phylum (Platyhelminthes) of soft-bodied usually much flattened acoelomate worms (as the planarians, flukes, and tapeworms) Hermaphrodite: An organism that contains both male and female organs.
Approximate Word count = 726
Approximate Pages = 2.9
(250 words per page double spaced)
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