To be black and blue means
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Answer:
a green pigment, present in all green plants and in cyanobacteria, which is responsible for the absorption of light to provide energy for photosynthesis.
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Explanation:
If you say that someone is black and blue, you mean that they are badly bruised. The next day I was black and blue and couldn't move my neck. Bud's nose was still black and blue.
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