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Answer:
The groupings of elements in the periodic table reveal various trends, present in groups such as the alkali metals and noble gases, or the lanthanides and actinides. The periodic table can be used to find information on elements or predict the properties of as-of-yet undiscovered elements.
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Global warming, the hole inside the atmosphere in Oklahoma , california .
Answer:
a nitrogen containing base, a pentose (five-carbon) sugar, and one or more phosphate groups
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