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Biology
What type of gas is provided by trees to help us breathe?
Biology
What type of gas is provided by trees to help us breathe?
Nitrogen
Oxygen
Carbon Dioxide
Helium
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Which of the following human traits can be used, like fingerprints, for identification?
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What openings in a leaf allow gas exchange?
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Which form of communication does a bird use?
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Which of these snakes is a pit viper?
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What is the fold of tissue that surrounds a mollusk's soft body?
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Why are many flowers brightly colored?
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Which is the sheet-like muscle at the bottom of a human chest?
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