| 21. | Most adult scaphopods live their lives entirely buried within the substrate.
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| 22. | The PAI aids in adhering the fluoropolymer to the metal substrate.
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| 23. | This digging action opens up the substrate to expose the clams.
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| 24. | The imaging of substrate on the platesetter is accomplished by laser.
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| 25. | The chromosomes are firmly attached to a substrate, usually glass.
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| 26. | Maleic anhydride is a classic substrate for Diels-Alder reactions.
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| 27. | Several interesting cases are worth noting in this selection of substrates.
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| 28. | They prefer the bottom to be clean sand and gravel substrates.
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| 29. | Some polishing waxes contain powdered rotten stone in a paste substrate.
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| 30. | Many substrates cannot be used because of their fragility or impurity.
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