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The climate [critics / crisis] may be posing an existential threat to many species of shark. A new study has [revelled / revealed] that the acidification of the world's oceans is causing sharks' teeth [to / in] decay. It is well known [at / in] the scientific community that increasing ocean acidity is damaging calcified species [like / liked] corals, molluscs, and sea urchins. This led marine biologists to research whether shark teeth are at similar [risk / risky] . Lead author of the study, Maximilian Baum, investigated [whether / whatever] "sharks that swim with their mouths open to ventilate their [fills / gills] and have constant seawater exposure might also be [vulnerable / vulnerability] ". He concluded that "even the teeth of apex predators show visible damage under acidified [conditions / condition] ".

Baum and his colleagues analyzed 42 teeth from 10 blacktip reef sharks at an [aquaria / aquarium] in Germany. They [paced / placed] the teeth in two separate water tanks for eight weeks. The salt water in one tank had a pH level [of / off] 8.2, which is similar to current ocean [average / averages] . The water in the other tank was more acidic, [with / within] a pH level of 7.3. Baum found that the teeth [in / at] the more acidic water had "visible surface damage". This included cracks and cavities, increased [roof / root] decay, and structural deterioration. He said ongoing damage could [compact / impact] how sharks [food / feed] in the future. Such damage could potentially trigger "domino effects" across the [healthy / health] of many marine ecosystems.