Biology
What "trapdoor" on your windpipe helps keep out food particles?
More Questions from Biology
What is the outer skeleton of organisms such as spiders and insects called?
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What powdery substance contains the male sex cells of a flower?
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What system helps animals exchange carbon dioxide and oxygen?
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During which of the following biological phases does "crossing over" take place?
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What are large male gorillas often called because of the coloration of their hair?
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Fish take in oxygen through their gills; what do insects take in oxygen through?
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What arctic sea whale has one long horn on its head?
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