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Digesters often use animal wastes (dung slurry).
So the correct answer is Animal wastes.
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Weapons-grade fission commonly uses U-235.
So the correct answer is 92 U 235.
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Hydrogen makes up most of the observable universe's ordinary matter.
So the correct answer is Hydrogen.
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Neutrons are electrically neutral.
So the correct answer is Neutrons.
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That process is an occlusion.
So the correct answer is An occlusion.
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Concentrated H₂O₂ is poisonous to tissues.
Hence the keyed answer is is poisonous to tissues.
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