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| How many species of invertebrates are estimated to exist? |
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| How many phyla are animals classified into? |
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| What phyla contains vertebrates? |
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| What phylum are pore bearing animals such as sponges? |
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| What phylum contains animals with two true tissue layers, a jelly-like layer in between and includes coral, jellyfish, and sea anemone? |
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Term
| What are specialized stinging cells in Cnideria? |
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| What phylum includes animals with 3 true tissue layers, bilateral symmetry, a true head and tail, and include flatworms such as planarians and tapeworms. |
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| What phylum are small free-living worms, some are parasitic, humans are susceptible to them, and consist of roundworms and pinworms. |
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| What phylum includes segmented bodied worms that have improved locomotion? |
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| What phylum includes soft-bodied animals with shells, a muscular foot, a mantle covering internal organs and include clams, oysters, snails, slugs, and octopi? |
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| What phylum includes animals with an internal skeleton, water vascular system, and includes sea starts, sea urchins, and sea cucumbers. |
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| What phylum include members with an exoskeleton, segmented body, paired jointed appendages, and an open circulatory system, and include crawfish, spiders, and centipedes? |
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| What class contains crabs, crawfish, and shrimp? They have two pair of antennae, compound eyes, and opposing mandibles? |
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