which substance in body contains iron?
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A swift current occurring in a narrow passage connecting two large bodies of water which is produced by the continuously changing difference in height of tide at the two ends of the passage is called a(n)().
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CO2 cylinders,which protect the small space in which they are stored must().
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The simplest animals are those whose bodies are simplest in structure and which do the things done by all living animals, such as eating, breathing, moving and feeling, in the most_______way.
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In the chemical equation shown in the passage, the carbon in CO2 becomes part of which of the following types of molecules?
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