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Endothermic Vertebrates

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Question
Answer
Birds   show
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clutch   show
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show strong, lightweight feathers that give the bird flight and shape  
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down feathers   show
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preening   show
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mammals   show
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show produce milk for feeding the young  
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show mammals that have fur but lay eggs with leathery shells  
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show mammals that give birth to immature young that crawl into a pouch to finish developing  
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show mammals that give birth to live, completely developed young  
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show the time it takes for the embryo to develop inside the uterus  
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placentals   show
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placenta   show
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umbilical cord   show
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show developing baby inside the female.  
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Created by: hubblep
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