For each of the following research questions, determine whether an observational study, an experiment, or neither should be used to answer the question. Note - each term on the right may be used more than once or not at all. What proportion community [ Choose ] college students successfully complete a transfer-level English course? Are non-elite soccer players [ Choose ] less likely to develop arthritis of the hip or knee than elite soccer players? Does shifting flora and fauna Choose ] to new habitats lead to the extinction of some species? Does consumption of simple [Choose ] carbohydrates increase the oxidation of LDL cholesterol