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Biology 19 Online
OpenStudy (anonymous):

The Challenger Deep: is the deepest known ocean trench was the bathyscaph manned by Walsh and Piccard is a submersible ship for deep-sea exploration is an experimental submarine home

OpenStudy (anonymous):

im sure it is the first one....although it isnt an actual "trench" in itself, it is a point Inside the Mariana Trench, and the rest of the options all seem to be vehicles

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