Concept:This is a second conditional sentence, used for an imaginary present situation.Explanation:The if-clause uses the simple past: "If I owned a zoo".The main clause needs a modal verb to express an imaginary result."might" is a modal verb, so it must be followed by the base verb "interact"."might interacted" is wrong because a modal verb is never followed by a past form.Therefore, the blank takes "might interact".Answer:might interact