The bound morpheme non is the negator for life-threatening here, so 'life-threatening' is more coherent. This does not come across with nonlife-threatening, which would seem to imply a threat to non-life. Is there any difference in usage between inconclusive and non-conclusive (nonconclusive)?
Understanding the Context
Inconclusive is more popular in research compared to non-conclusive, using pubmed search, 20,872 and 260 … The usage of a non-breaking space is explained in a wikipedia article under non-breaking spaces and controlling line breaks and below in items 1 and 5: It is advisable to use a non-breaking space (also … Except non is not an english word, it is a prefix of latin origin. Which is why american style manuals will always ask you to merge it with the subsequent word, without a hyphen. British rules differ, and …
