This certain type of rock is constructive, not only from the fact that it was made up from earthly habits. But also it breaks down very easily, which can help the environment. Therefore a sedimentary rock is constructive.
Alpha helix and beta sheets are the secondary structure of protein
A carbonate because the oxygen neutralizes the reactive coding of the calcium in its original form.
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The distance from one crest to another crest or from one trough to another trough is called wavelength. Hope it helps