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9th Grade Biology Sec. 23

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Question
Answer
Collagen   Three stranded protien, unique to animals, that combines to form strong, flexible fibers.  
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Homeotic   Genes that control early devolepment in animals.  
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Homeobox   Genes that define the head to tail pattern of development in early animal embryos; also call Hox genes.  
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Vertebrate   Animal with an internal segmented backbone.  
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Invertebrate   Animal without a backbone.  
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Phylum   Group of animals defined by structural and functional characteristics that are different from every other animal phylum.  
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Bilateral Symmetry   Body plan of some organisms in which the body can be divided equally along one plane.  
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