Bottom-dwellers survived because of their specific undersea roles, even when almost every other marine species died out, a new study finds.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/7YBEGpb_z-Q" height="1" width="1"/>
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Bottom-dwellers survived because of their specific undersea roles, even when almost every other marine species died out, a new study finds.<img src="http://feeds.feedburner.com/~r/DiscoveryNews-Top-Stories/~4/7YBEGpb_z-Q" height="1" width="1"/>