The answer is C where the star is found in the sky. If a star is moving toward us, its spectroscopy will be observed at shorter wavelengths, this is called "blueshifted". If the star is moving away from us, the lines will appear in longer wavelengths, and that's called "redshifted".
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I would say A because if the ball is rolling down the hill the it won't stop till it hits the bottom.
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Answer:
a plant cell
Explanation:
plants are the only ones with cell walls