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Describe how a photosystem converts light energy to chemical energy
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Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?
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Natural selection changes allele frequencies because some survive and reproduce more successfully than others.
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Describe how a photosystem converts light energy to chemical energy...
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