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Oxygen
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Riley confronts a big fear
2030
41624
Can you hold your breath longer than a fur seal?
434
31958
How do rays breathe underwater?
255
20017
How much oxygen do sea plants produce?
399
16945
Kelp, help!
651
10563
Tricks to hold your breath longer
158
5772
Should all scientists wear glasses?
20
2267
Can you hold your breath for 45 secs?
35
2215
How deep can fur seals dive?
16
2031
How can fur seals hold their breaths?
4
1736
