Unit 8 (invertebrates)
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Radial symmetry | The arrangement of body parts in a circle around a central axis
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Bilateral symmetry | The body of some organisms in where the body can be divided equally along only one plane
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Spinnerets | The silk spinning organs of arachnids
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Cephalothorax | The head and trunk region contains eyes anntennae gills and mouth. Found in crustaceans
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Sessile | Unable to move from a fixed point
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Gizzard | Used to grind food similar to a second stomach
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Filter feeders | Animals that eat by straining particles in the water
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Gastrovascular pouch | A sac-like digestive system
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Nematocysts | A capsule containing a thin, coiled tubule with a poisones barb at one end
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Cnidocytes | explosive cell containing one giant secretory organelle or cnida, generally used to capture prey or defend from predators. This defines the Cnidaria phylim
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Polyp | A tube-shaped body form of a Cnidarian in which the mouth and tentacles face upward
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Medusa | Umbrella-shaped body form of a Cnidarian in which the mouth and tenticals are on the underside
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Pharynx | the canal part immediately behind the mouth in invertebrates.
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Closed Circulatory system | the blood closed at all times within vessels of different size and wall thickness, and does not normally fill body cavities
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Setae | a stiff hairlike or bristlelike structure, especially in an invertebrate.
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Clitellum | a raised band encircling the body of oligochaete worms and some leeches, made up of reproductive segments.
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Chitin | Tough, protective polysaccharide that makes up an Arthropod'a exoskeleton
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Molting | To shed old exoskeleton to ale way for new growth
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Open Circulatory system | No true blood vessels, the blood is pumped through and around the tissues
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Spiracles | A hole in the body of an insects exoskeleton through which air can be taken or released
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Tracheal tubes | Similar to a throat
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Compound eyes | an eye consisting of an array of numerous small visual units, as found in insects and crustaceans used to get a bigger and better image
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Mandible | Appendage that is used to crush and bite food
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Complete Metamorphosis | Process by which immature organisms change their body for before becoming an adult
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Crop | used to store undigested food
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Incomplete metamorphosis | Process by which immature arthropod'a look similar to the adults
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Mimicry | A technique used to evade predators by copying the look of another, but more dangerous animal of that size
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Chelicerate | Arthropod that has four antennae and has four pairs of walking legs and a pair of fang-like mouth parts
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Camouflage | A technique used to blend into ones surroundings
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Asymmetry | Having no symmetry
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