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57 Cards in this Set
- Front
- Back
annelid
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An invertebrate; a segmented worm (e.g., oligochaete, leech, or polychaete).
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arthropod
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Invertebrate with hard exoskeleton, specialized segments, and jointed appendages.
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bilateral symmetry
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Body plan with axis from anterior to posterior end, separated into right and left sides, and dorsal and ventral surface.
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cephalization
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Over time, the concentration of sensory structures and nerve cells in a head.
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cnidarian
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Type of radial invertebrate at the tissue level of organization; the only nematocyst producer.
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coelom
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A peritoneum-lined cavity between the gut and body wall of most animals.
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collar cell
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In sponge body wall, a flagellated cell
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cuticle
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Of annelids, a thin, flexible coat. Of arthropods, a lightweight exoskeleton hardened with protein and chitin.
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deuterostome
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Bilateral animal in which the anus forms from first indentation in the embryo (e.g., echinoderms, chordates).
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echinoderm
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Type of invertebrate with calcified spines, needles, or plates on body wall. Radial with some bilateral features (e.g., sea stars).
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ectoderm
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The first-formed, outermost primary tissue layer of animal embryos; gives rise to nervous system tissues and integument's outer layer
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endoderm
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Inner primary tissue layer of animal embryos; source of inner gut lining and derived organs.
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exoskeleton
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External skeleton (e.g., hardened cuticle of arthropods).
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flatworm
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One of the simplest invertebrates having organ systems; a turbellarian, fluke, or tapeworm. Some are notorious parasites.
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gut
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Generally, a sac or tube from which food is absorbed into internal environment. Also, gastrointestinal tract from stomach onward.
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hermaphrodite
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Individual having both male and female gonads.
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invertebrate
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Any animal without a backbone.
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larva
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Immature stage between an embryo and adult in many animal life cycles.
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medusa
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Of cnidarian life cycles, a freeswimming, bell-shaped stage, often with oral lobes and tentacles extending below the bell.
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metamorphosis
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Major changes in body form of certain animals; hormonally controlled growth, tissue reorganization, and remodeling of body parts leads to adult form.
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mollusk
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Only invertebrate with mantle draped over a soft, fleshy body; most have an external or internal shell. Diverse body plans and sizes (e.g., gastropods, bivalves, and cephalopods).
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molting
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Periodic shedding of worn-out or too small body structures. Permits some animals to grow in size or renew parts.
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nematocyst
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Cnidarian capsule that has a dischargeable, tube-shaped thread, sometimes barbed; releases a toxin or sticky substance.
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protostome
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Lineage of coelomate, bilateral animals that includes mollusks, annelids, and arthropods. The first indentation to form in protostome embryos becomes the mouth.
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radial symmetry
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Animal body plan having four or more roughly equivalent parts around a central axis (e.g., sea anemone).
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roundworm
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Cylindrical, bilateral, cephalized animal with a false coelom and a complete digestive system. Most cycle nutrients in communities; many are parasites.
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sponge
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Animal with no body symmetry, and no tissues, and phagocytic collar cells in its body wall. Lineage dates from precambrian.
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vertebrate
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Animal having a backbone.
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water-vascular system
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Of sea stars and sea urchins, a system of many tube feet that are deployed in synchrony for smooth locomotion.
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hermaphrodite
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Individual having both male and female gonads.
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invertebrate
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Any animal without a backbone.
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larva
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Immature stage between an embryo and adult in many animal life cycles.
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medusa
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Of cnidarian life cycles, a freeswimming, bell-shaped stage, often with oral lobes and tentacles extending below the bell.
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metamorphosis
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Major changes in body form of certain animals; hormonally controlled growth, tissue reorganization, and remodeling of body parts leads to adult form.
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mollusk
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Only invertebrate with mantle draped over a soft, fleshy body; most have an external or internal shell. Diverse body plans and sizes (e.g., gastropods, bivalves, and cephalopods).
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molting
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Periodic shedding of worn-out or too small body structures. Permits some animals to grow in size or renew parts.
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nematocyst
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Cnidarian capsule that has a dischargeable, tube-shaped thread, sometimes barbed; releases a toxin or sticky substance.
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protostome
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Lineage of coelomate, bilateral animals that includes mollusks, annelids, and arthropods. The first indentation to form in protostome embryos becomes the mouth.
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radial symmetry
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Animal body plan having four or more roughly equivalent parts around a central axis (e.g., sea anemone).
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roundworm
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Cylindrical, bilateral, cephalized animal with a false coelom and a complete digestive system. Most cycle nutrients in communities; many are parasites.
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sponge
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Animal with no body symmetry, and no tissues, and phagocytic collar cells in its body wall. Lineage dates from precambrian.
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vertebrate
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Animal having a backbone.
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water-vascular system
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Of sea stars and sea urchins, a system of many tube feet that are deployed in synchrony for smooth locomotion.
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hermaphrodite
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Individual having both male and female gonads.
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invertebrate
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Any animal without a backbone.
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larva
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Immature stage between an embryo and adult in many animal life cycles.
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medusa
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Of cnidarian life cycles, a freeswimming, bell-shaped stage, often with oral lobes and tentacles extending below the bell.
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metamorphosis
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Major changes in body form of certain animals; hormonally controlled growth, tissue reorganization, and remodeling of body parts leads to adult form.
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mollusk
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Only invertebrate with mantle draped over a soft, fleshy body; most have an external or internal shell. Diverse body plans and sizes (e.g., gastropods, bivalves, and cephalopods).
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molting
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Periodic shedding of worn-out or too small body structures. Permits some animals to grow in size or renew parts.
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nematocyst
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Cnidarian capsule that has a dischargeable, tube-shaped thread, sometimes barbed; releases a toxin or sticky substance.
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protostome
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Lineage of coelomate, bilateral animals that includes mollusks, annelids, and arthropods. The first indentation to form in protostome embryos becomes the mouth.
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radial symmetry
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Animal body plan having four or more roughly equivalent parts around a central axis (e.g., sea anemone).
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roundworm
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Cylindrical, bilateral, cephalized animal with a false coelom and a complete digestive system. Most cycle nutrients in communities; many are parasites.
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sponge
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Animal with no body symmetry, and no tissues, and phagocytic collar cells in its body wall. Lineage dates from precambrian.
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vertebrate
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Animal having a backbone.
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water-vascular system
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Of sea stars and sea urchins, a system of many tube feet that are deployed in synchrony for smooth locomotion.
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