B. Ecosystem. By definition, an ecosystem is composed of both its abiotic and biotic factors. A community is the population of living organisms in an ecosystem, and a habitat is the generally abiotic location in which the community lives, so "ecosystem" can also be thought of as the inclusion of a community and habitat together. "Pure culture" would more closely describe a population that you might grow on a Petri dish, for instance.
You need to recognize that the higher on the food chain, the fewer the number of organisms that occupy that level. This is because of the energy that is available from one level to the next has to decrease since it is used for life's processes.
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The correct answer is that nurse should give the patient sedatives and analgetics.
Terminal weaning is the incrementally withdrawal of mechanical ventilation from a patient who is not expected to survive. The process includes decreasing the ventilatory rate or decreasing inspired oxygenis until the patient is no longer receiving that ventilatory support. Sedation an analgetics are used in this case in order to control distress and relief the pain. Palliative sedation is a process of continuous usage of sedative drug in the last hours or days of a dying patient's life.