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Invertebrate Unit

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Question
Answer
closed circulatory system   transports fluids in tubes through the body.  
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exoskeleton   rigid, outer covering of an organism  
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invertebrate   animal without a backbone  
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open circulatory system   circulatory fluids are not contained within vessels (instead are free to move between tissues/organs with body cavity)  
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regeneration   ability to regrow lost body parts  
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vertebrate   animal with a backbone  
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water vascular system   system of fluid-filled interal tubes that carry food, oxygen & waste.  
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asymmetrical   objects that do not have symmetry  
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bilateral symmetry   type of symmetry in which parts are arranged around a center line. Objects with this symmetry can be divided into two identical halves.  
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radial symmetry   type of symmetry in which parts are arranged around a center point.  
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Animal Characteristics   heterotrophs (consumers), multicellular, eukaryotes, lack cell wall, contain lysosomes, most can move, most reproduce sexually  
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Invertebrate Characteristics   no backbone, most have nerves, gut, symmetry used to describe shape  
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Nerves   sense change in environment, carry messages, allow oragisms to respond  
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Gut   site of digestion  
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stinging cells   structures on tentacles that Cnidarians use to sting their prey  
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Common Characteristics of Arthropods   exoskeleton, segmented bodies, jointed limbs, well developed nervous system  
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Arachnids   2 body segments (cephlothorax, abdomen) & 8 legs  
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Insects   3 body segments (head, thorax, abdoment) & 6 legs  
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Echinoderm Characteristics   spiny skin, 5 part body, tube feet, water vascular system, endoskeleton  
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segmented bodies   characteristics that annelids & arthopods share (evidence of evolution)  
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Phylum Porifera   Members of this phylum are covered with pores and have one large opening at the top of their body to excrete wastes.  
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Phylum Cnidaria   Animals that belong to this phylum have a hollow central cavity, one opening, tentacles with stinging cells, and one of two body forms (polyp and medusa).  
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Phylum Platyhelminthes   This phylum of worms have a flat body shape, bilateral symmetry, and can regenerate  
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Phylum Nematoda   Worms that belong to this phylum have a round body structure  
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Phylum Annelida   Animals that belong to this phylum are worms that have segmented bodies, a closed circulatory system, and bristles for burrowing.  
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Phylum Mollusca   This phylum is broken into three groups (Gastropods, Bivalves, and Cephalopods) based upon the type of shell and muscular foot the animal has. Some of these animals have tentacles.  
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Phylum Arthopoda   Members of this phylum have four common characteristics: exoskeleton, segmented body, jointed appendages and nervous system.  
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Phylum Echinodermata   Members of this phylum have spiny skin, a five part body, endoskeleton, tube feet, and can regenerate.  
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Phylum Porifera   sponges  
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Phylum Cnidaria   jellyfish, coral, hydra  
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Phylum Platyhelminthes   flatworms, planarian, flukes, tapeworm  
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Phylum Nematoda   roundworms- hookworm & Trichinella  
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Phylum Annelida   earthworm, leech, marine worms  
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Phylum Mollusca   snails, slugs, squid, octopus, clams, oysters  
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Phylum Arthopoda   insects, crustaceans, spiders, millipedes, centipedes  
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Phylum Echinodermata   starfish, sand dollar, sea urchin, sea lilly  
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