Answer:
The role that the cane toad play in the Hawaiian Islands is "invasive species"
Explanation:
The excerpt describes the process of how the cane toad was introduced to the Hawaiian Islands, as a new species in this land and to control pests, it also mentions that by not having many predators the number of cane toads grows rapidly, this two points are clear examples of what represents an invasive species which come from a different land and grows excessively in a new one becoming a new threat to the environment. As the name of the kind of role they played shows, they invaded the Hawaiian lands.
The private sector can play a role in poverty alleviation by primarily offering jobs to people out of work ie by providing employment directly in the company or indirectly in associated industries that get business from the enterprise in question which may be supplier or a contractor for say the principal mining business.
Parallel structure means using the same pattern of words to show that at least two ideas are equally important as each other. Parallel structure can be used to create a rythem or a pattern in certain types of sentences.