Final answer:
The correct term for species with male and female reproductive structures in different organisms is 'dioecious'. where an individual organism contains both male and female reproductive organs and can often self-fertilize.
Step-by-step explanation:
In the context of reproductive strategies in different organisms, the term that correctly fills in the blank in the question is dioecious. In dioecious species, male and female reproductive structures occur in different organisms, which means that individual organisms are either male or female.
This is different from monoecious species, where both male and female reproductive structures can be found on the same organism. Additionally, this concept is distinct from being hermaphroditic, where an individual organism contains both male and female reproductive organs and can often self-fertilize.