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Chapter 17 Terms - Biology 1421 Chapter 17 Amphibian a...

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Biology 1421 Chapter 17 Amphibian: a member of the chordate class Amphibia, which includes the frogs, toads, and salamanders, as well as the limbless caecilians. Arthropod: a member of the animal phylum Arthropoda, which includes the insects, spiders, ticks, mites, scorpions, crustaceans, millipedes, and centipedes. Conifer: a member of the class to tracheophytes (Coniferophyta) that reproduces by means of seeds formed inside cones and that retains its leaves throughout the year. Endosymbiont Hypothesis: the hypothesis that certain organelles, especially chloroplasts and mitochondria, arose as mutually beneficial associations between the ancestors of eukaryotic cells and captured bacteria that lived within the cytoplasm of the pre-eukaryotic cell. Eukaryote: an organism whose cells are eukaryotic; plants, animals, fungi, and protists are eukaryotes. Exoskeleton: a rigid external skeleton that supports the body, protects the internal organs, and has flexible joints that allow for movement.
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