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When coal has reached it hardest, darkest form, it is called select one: 0 a. sub-bituminous b. lignite c. bituminous d. antrhacite next page
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Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z
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Natural selection changes allele frequencies because some survive and reproduce more successfully than others.
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How does the structure of the inner ear allow for the perception of pitch? of sound intensity?...
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