Question

which word best completes the sentence? if left unchecked, invasive species can have a impact on native flora and fauna, disrupting the balance of biodiversity in an ecosystem. deleterious deficient dogged disreputable

Explanation:

Invasive species, when left unchecked, negatively affect native flora and fauna and disrupt biodiversity. "Deleterious" means causing harm or damage, which best fits the context of the sentence as it describes the negative impact of invasive species. "Deficient" means lacking something, "dogged" means persistent, and "disreputable" means having a bad reputation, none of which accurately describe the impact as well as "deleterious".

Answer:

deleterious