Why is there only one human species? | BBC

[liferocks]

The BBC has a short article and video of why, since there were several hominid species, only one survives today.
Warning: Contains evolution theory. Not suitable material for science deniers.
http://www.bbc.co.uk/news/science-environment-13874671
James.

Video proclaims that femur in question was from an Erectus and is “similar to us”. How do they know that the femur was from an “erectus” (it looks exactly like absolutely any human femur)?
The writings under the “Stiff Competition” sub heading claim "The Homo erectus brain did not devote a lot of space to the part of the brain that controls language and speech," as quoted by John Shea.
Did Professor Shea arrive at this conclusion from scientific data obtained from carefully analyzed brain matter obtained from fossil records (think about it), was he able to question the Erectus, or were conclusions made based on, now here’s the big word of the day, “FAITH” in science.
By the way Anymouse, I’m not denying science, just asking questions.
On the matter of the BBC did anybody else hear this. A man was in London was caught trying to steal 10 pounds of batteries by actually eating all of them. The police have caught him and he has been charged. Sorry I know that one was lame.