the introductory passage describes the specialized organisms that live deep in the ocean under great pressure. there are other unusual characteristics in ocean ecosystems. for example, conditions in the deep ocean sediments are unique in many respects. while the density of organisms is low as a result of extreme conditions, the overall number of organisms present is quite high because of the enormous volume of this habitat. in addition, as discussed in the introductory passage, these ecosystems are important to study because they harbor unique lineages of microbes. complete the following sentences describing the conditions found in deep marine sediments.