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Oxygen
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Can you hold your breath longer than a fur seal?
233
15754
Riley confronts a big fear
524
14381
How do rays breathe underwater?
125
11067
How much oxygen do sea plants produce?
82
4618
Kelp, help!
72
3788
Tricks to hold your breath longer
77
2916
Can you hold your breath for 45 secs?
17
755
How deep can fur seals dive?
11
564
How can fur seals hold their breaths?
3
508
Should all scientists wear glasses?
12
451
