Select all that apply. the spectrum of star x is compared to a reference hydrogen spectrum. what can be concluded about star x? a. star x is showing radial motion. b. star x is moving toward the earth. c. star x is moving away from the earth. d. star x may be moving, but its motion is not radial.
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Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?
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Select all that apply. the spectrum of star x is compared to a reference hydrogen spectrum. what can...
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