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Oxygen
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Riley confronts a big fear
2279
42674
Can you hold your breath longer than a fur seal?
441
32478
How do rays breathe underwater?
436
20424
How much oxygen do sea plants produce?
611
17721
Kelp, help!
743
10991
Tricks to hold your breath longer
164
5874
Should all scientists wear glasses?
22
2496
Can you hold your breath for 45 secs?
471
2440
How deep can fur seals dive?
16
2112
How can fur seals hold their breaths?
4
1852
