Typically biologists with expertise in relevant fields will come to a consensus view. It is not necessarily fixed - as is normal in science, if new data becomes available (including new analyses of existing data), a species designation may be revised.The use of the passive voice leaves one wanting. Who does the "considering"? Once "considered", is it fixed?
Well... no. It is no different from any other observational categorization in science; at some point, the data may suggest a tentative novel category. As more data arrives and is analysed, the categorisation may be more or less well supported. The categorization may change as a consequence.If not then your sources as evidence of direct observation of speciation are pretty much useless as evidence.
This is pretty basic stuff.
Yes - and?... fundamental logic tells us that the first observation of a thing is not necessarily the first instance of a thing.
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