Explain, do not troll. I am author in Phys.Rev.E. I have perfect brain.
I am not trolling. If you have a perfect brain it should be self evident, now that I have pointed out that you are in error.
We know that Spanish derived from Latin, as did French, Italian, Romanian, Portugese and a tranche of minor languages. There is a continuum of these languages geographically and temporally. The division in time between Latin and Spanish, or geographically between Spanish and Portugese is artifical. One can readily look at the extremes and say "Esto es espanol" and "Hoc enim Latine", but in between the transition is gradual and ultimately is made for convenience, not because there is major distinction between adjacent tongues.
And that mirrors what we see with species, geographically and temporally. We can look at skeletal remains and say, "yes, this is defnitely
homo sapiens, and this is definitely
homo erectus, but this third one is intermediate. On balance, I think I shall call it an example of
homo erectus, but Fred will insist it is early
homo sapiens and Mary believes we can avoid the dispute by classifying it as an intermediate species,
homo antecessor."
Such debates relate primarily to convenience. Humans like to name things. Scientists like to do so systematically, but when we are describing a continuum the important thing to remember is that it is a continuum. That is the fact that you seem wholly unaware of and that renders your understanding so deeply flawed.
