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Owls, bats, and crickets are ____ (active at night).
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feral
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The ____ (bottom) shell of a turtle is called the plastron.
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migratory
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Mammals are classified as monotreme, marsupial, or ____.
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nocturnal
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Most birds and reptiles are ____ (egg-laying).
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oviparous
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Cobras, vipers, scorpions, and centipedes are ____ predators.
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parasitic
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Domesticated animals that have returned to the wild are ____.
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placental
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Arctic terns, caribou, monarchs, and salmon are ____ animals.
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venomous
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Most roundworms are free-living. Most flatworms are ____.
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ventral
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