Sorry for doin' this you all but my printer doesn't work and I don't have a floppy disk. From here, I can print it out at school tomorrow, muhahahaha!!! I would have e-mailed it to myself but they blocked mail servers....muhaahahah!!!!
Chapter 26 Vocabulary
26-1 Invertebrate: Animal that does noto have a backbone or vertebral column Vertebrate: Animal that has a vertebral column, or backbone Feedback Inhibition: Process in which the product or result stops or limits the process Blastula: Hollow ball of cellsl formed when a zygote undergoes a series of divisions Protostome: Animal whose mouth is formed from its blastopore Deuterostome: Animal whose anus is formed from the blastopore of a blastula Anus: Opening through which wastes leave the digestive track Endoderm: Innermost germ layer of most animals Mesoderm: Middle germ layer of most animals Ectoderm: Outermost germ layer of most animals Radial Symmetry: Body plan in which body parts repeat around the center of the body Bilateral Symmetry: Body plan in which only a single, imaginary line can divide the body into two equal halves Cephalization: Concentration of sense organs and nerve cells at the front of an animal’s body
26-2 Choanocyte: Specialized cell in sponges that uses a flagellum to move a steady current of water through the sponge Osculum: In sponges, it’s the main opening through which filtered water is discharged Spicule: Spike-shaped structure that makes up the skeletons of harder sponges Archaeocyte: Specialized cell in a sponge that makes spicules Internal Fertilization: Process in which eggs are fertilized inside the female’s body Larva: Immature stage of an organism that looks different from the adult form Gemmule: Group of archaeocytes surrounded by a tough layer of spicules 26-3 Cnidocyte: Stinging cell located along the tentacles of cnidarians Nematocyst: Stinging structure within each cnidocyte of a cnidarian that is used to poison or kill prey Polyp: Usually sessile stage of the life cycle of a cnidarian that has a cylindrical body with armlike tentacles Medusa: Motile stage of the life cycle of a cnidarian that has a bell-shaped body Gastrovascular Cavity: Digestive chamber with a single opening, in which cnidarians, flatworms, and echinoderms digest food Nerve Net: Loosely organized network of nerve cells that together allow cnidarians to detect stimuli Hydrostatic Skeleton: Layers of circular and longitudinal muscles, together with the water in the gastrovascular cavity, that enable movement External Fertilization: Process in which eggs are fertilized outside the female’s body
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