Biology
In which fluid-filled cavity do organs develop in organisms such as earthworms?
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What kind of tree loses all its leaves during a dormant period like winter?
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What system helps animals exchange carbon dioxide and oxygen?
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What part of the flower surrounds the inside parts of the flower?
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In what season do the leaves of some trees turn colors and start falling to the ground?
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What nerve tissue transmits light signals from your eye lens to the brain?
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What was the dominant invertebrate of Mesozoic seas?
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What arctic sea whale has one long horn on its head?
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