Answer to Dictation 1
The climate crisis may be posing an existential threat to many species of shark.
Go to Dictation 2
Answer to Dictation 2
The acidification of the world's oceans is causing sharks' teeth to decay.
Go to Dictation 3
Answer to Dictation 3
This led marine biologists to research whether shark teeth are at similar risk.
Go to Dictation 4
Answer to Dictation 4
Sharks that swim with their mouths open to ventilate their gills.
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Answer to Dictation 5
The teeth of apex predators show visible damage under acidified conditions.
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Answer to Dictation 6
His colleagues analyzed 42 teeth from 10 blacktip reef sharks.
Go to Dictation 7
Answer to Dictation 7
They placed the teeth in two separate water tanks for eight weeks.
Go to Dictation 8
Answer to Dictation 8
Cracks and cavities increased root decay and structural deterioration.
Go to Dictation 9
Answer to Dictation 9
He said ongoing damage could impact how sharks feed in the future.
Go to Dictation 10
Answer to Dictation 10
Trigger domino effects across the health of many marine ecosystems.
See the shark teeth lesson for the whole text.
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