Subjects with a serious illness may be at risk for exploitation because they may be desperate for a possible cure. this is an example of:

Medical Vulnerability

Explanation:

Medical vulnerability is a state where over possible violations  of health care ethics rule is put in place which thereafter affects a patient thereby leading to liability.Prevention or correction of these issues of  vulnerability is likely to have a positive impact to an increased quality of medical care.

well for one plants are always the producer, so a is the answer. a wolf is more of the consumer(predator) and the deer is the prey so i know those two are out of the question. also mushrooms are fungi/fungus so a is the producer.