Gap Fill - Sharks - Level 5

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   acidic      aquarium      averages      cavities      damage      ecosystems      potentially      salt      separate      such   

Paragraph 2

Baum analyzed 42 teeth from blacktip reef sharks at an in Germany. He put the teeth in two water tanks for eight weeks. The water in one tank had a pH level similar to current ocean . The water in the other tank was more . Baum found that the teeth in the more acidic water had visible damage. This included , root decay, and structural deterioration. He said ongoing could impact how sharks feed. He added that damage could trigger "domino effects" across many marine .

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