Answer:
I would say:
D. A non-native plant species will begin to reproduce rapidly after being introduced into a swamp ecosystem.
Explanation:
Scientific knowledge is constantly changing with the development of new and improved techniques, tools, and methodologies that result in a new discovery or novel data that is relevant for a given field.
In this case, A) Identifying a new species, B) Protecting an endangered species, C) Discovering a new element and adding it to the periodic table are extremely relevant and important findings that contribute to the improvement of scientific knowledge.
On the other hand, introducing a non-native species into a swamp ecosystem will definitely result in a rapid reproduction which will probably lead to new research and potential strategies to eradicate non-native species. However, in this scenario, there is no discovery or data that tells us new scientific information.