Final answer:
New evidence would need to demonstrate the presence of specific characteristics or traits of living organisms within the fossils.
Step-by-step explanation:
In order to force the authors of this article to conclude that fossils are organisms that are now extinct, new evidence would need to be presented that clearly demonstrates the presence of characteristics or traits specific to living organisms within the fossils. This evidence could include things like preserved soft tissues, distinct structures or organs, or traces of biological activity such as burrows or tracks.