I would say suit doesn't belong.
All of the other words could be classified as verbs, and suit simply as a noun in almost any case.
Species Diversity
-All the other answer choices are defined for a different purpose. Although it might be too obvious that species diversity is the answer because the word "species" is mentioned in the question, it's actually the right answer.
Let me know if I'm wrong or not,
Hope this Helps!
