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He collected the impact on damaged samples and as I said he was just looking at these under a microscope to see if there was any variation in them. They then narrowed their tooth collection down to 16 feet and they matched them all in pairs. One half of each went into a control tank and that had a notion pH of 8.1. The other half went into a tank and kept a 7.3 pH for 8 weeks. The boat tank temperatures and salinity were kept as close to as identical as possible. After two months they compared its heat and this time they looked under a scanning electron microscope. Those kept in the more acidic water were significantly more polluted and had far more cracks and holes, especially at the root and tooth base.