Why is there only one human species? | BBC

[Anymouse]

You say that we have studied and I will assume compared our brain to other primates but my question remains unanswered. The BBC is making comparisons to present human brains and the brain of the erectus, not of primates.
How did they arrive at scientific conclusions from something, in this case potentially a fossil, that could not possibly reveal the results that they are claiming?
Read the quote I previously posted and ask, "What was there from the erectus fossils, not present day humans or primates, to make a claim about functions of certain parts of the erectus brain?"

Uh, Erectus was a primate. As it was said, we know from studying brains and craniums how the brain develops inside the craniums of all animals we have studied, not just primates.
Y'ain't gonna get a cerebrum of a modern human in the cranium of a chimp, or Erectus. Won't fit, that's that.
Biology is not my specialty, (Romance novels and aircraft and shipboard electronics are), but since like most things in evolution, new stuff is piled onto old, and the old stuff is still there (we can see that comparing human brains for example, to other animals), it is not too hard to see by checking out an Erectus cranium what parts had not been piled on yet to the Erectus brain.

Actually there is one thing I do know that cavemen and Paris Hilton have in common. They both like to go clubbing.

That's cute.
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