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Tropical seas
Coral Reefs
The cities of the ocean. 25% of marine species live here, on 0.1% of the seafloor.
Species
1,000,000
Plant species
800
Endangered
50%
Pressure
Half of all coral lost since 1950
Surprise of the day
The blue-ringed octopus carries enough tetrodotoxin to kill 26 humans. There's no antivenom.
Who eats who
Apex predators on top. Energy flows down.
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