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soft sediment bottom

By St. Petersburg Coastal and Marine Science Center 2012 (approx.)
sediment bottom with microbial life as well as tiny worms, crustaceans, and molluscs
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Detailed Description

A nondescript soft sediment bottom like this is still teeming with microbial life as well as tiny worms, crustaceans, and molluscs. 

Sources/Usage

Public Domain.