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Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above
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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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Approximately what wavelength of light is best absorbed by chlorophyll a
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Which of the following best describes the difference between a mutualistic relationship and a parasi...
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