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Oxygen
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Riley confronts a big fear
820
21393
Can you hold your breath longer than a fur seal?
323
20926
How do rays breathe underwater?
182
13926
How much oxygen do sea plants produce?
122
7402
Kelp, help!
113
4712
Tricks to hold your breath longer
112
3931
Can you hold your breath for 45 secs?
22
1016
How deep can fur seals dive?
12
771
Should all scientists wear glasses?
14
655
How can fur seals hold their breaths?
3
637
