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Oxygen
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Riley confronts a big fear
1170
31097
Can you hold your breath longer than a fur seal?
382
27353
How do rays breathe underwater?
214
16781
How much oxygen do sea plants produce?
217
13816
Kelp, help!
184
8169
Tricks to hold your breath longer
131
4985
How deep can fur seals dive?
14
1487
Can you hold your breath for 45 secs?
24
1412
Should all scientists wear glasses?
16
1376
How can fur seals hold their breaths?
4
1173
