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Vocabulary for Module #16: Reptiles, Birds, and Mammals

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
show A shelled, water-retaining egg that allows reptile, bird, and certain mammal embryos to develop on land  
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show A poison that attacks the nervous system, causing blindness, paralysis or suffocation  
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Hemotoxin   show
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show An organism that is internally warmed by a heat-generating metabolic process  
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show Feathers with smooth barbules but not hooked barbules  
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Placenta   show
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show The period of time during which an embryo develops before being born  
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Mammary glands   show
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show Feathers with hooked and smooth barbules, allowing the barbules to interlock  
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