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Why do #whales breathe air if they live underwater? 
Why do whales, dolphins, and seals live in the ocean at all? 
#jellyfish in space and interplanetary humans 
Jellyfish existed hundreds of millions of years 
Polar Bear on sea ice in the #arctic 
Helmet jellyfish in the #Arctic #submarine 
The leopard seal (Hydrurga leptonyx) 
I'm going to start posting more stuff 
