Too many to count
Humans are the most common races in the galaxy and as such have become the standard for biology and culture that other races are measured against, at least as far as humans are concerned. Humans have the ability to mulitply and adapt in a wide variety of climates and tend to form communities wherever they go. This community building tends to attract other races and while Humans are often war-like they have managed to broker a peace with many of the sentient species of the galaxy.
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see also humanoid
Humans feature a single cardiopulmonary system, two legs, two arms, two eyes, and a variety of other features that have become "standard." Humans feature a variety of skin tones and races among their own people, a trait which is commonly ignored now that they have other races to fight with. These colors range from pale pink, yellow, brown, and dark brown.
Over the Generations humans have fractured or been fractured across many star systems. Several planets have become those they call home and as such their culture has splintered dramatically. There still remains a dispute as to which of three planets--Earth, Coruscant, and Alderin--is the actual Human Homeworld. As such all three are considered Human Homeworlds. From those three original bases Humans have spread across the galaxy and colonized a number of worlds which they have made their home or which they share as a home with other races. There are distinct culture divergences on the various Human worlds.