What is arguably the best-adapted organism for the deep uniform environment of the ocean?

Name: What is arguably the best-adapted organism for the deep uniform environment of the ocean?
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The brittle stars can be in very high densities on the sedimentary bottom. They feed by collecting nutritive particles along the grooves under their arms. Information can be found in the section The First Scientific Experiments Were Undertaken by Governments.

What Is Arguably the Best-Adapted Organism for the Deep Uniform