Gap Fill - Sharks - Level 4

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   acidic      current      deterioration      domino      marine      reef      salt      teeth      visible      water   

Paragraph 2

The researcher analyzed from blacktip sharks. He put the teeth in separate tanks for eight weeks. The water in one had an acidity level similar to ocean averages. The water in the other tank was more . The teeth in the more acidic water had damage, including cavities, root decay, and structural . Ongoing damage could impact how sharks feed. This could trigger " effects" across ecosystems.

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