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Biology Sec. 23
9th Grade Biology Sec. 23
| Question | Answer |
|---|---|
| Collagen | Three stranded protien, unique to animals, that combines to form strong, flexible fibers. |
| Homeotic | Genes that control early devolepment in animals. |
| Homeobox | Genes that define the head to tail pattern of development in early animal embryos; also call Hox genes. |
| Vertebrate | Animal with an internal segmented backbone. |
| Invertebrate | Animal without a backbone. |
| Phylum | Group of animals defined by structural and functional characteristics that are different from every other animal phylum. |
| Bilateral Symmetry | Body plan of some organisms in which the body can be divided equally along one plane. |