I think the answer would be C.Characterization because the author is describing the character
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A beach is a landform alongside a body of water which consists of loose particles. The particles composing a beach are typically made from rock, such as sand, gravel, shingle, pebbles, etc, or biological sources, such as mollusc shells or coralline algae.
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i think its because if one of the models are broken or wrong they have a back up or just try to get better info then the others or just to get extra data.
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