If you mean like "human beings" Joanne, I can only agree; I see absolutely no reason why human beings could not have been invented more than once.
But I must take exception to your constant repetition- not unreminiscent of those cute little red-guards chanting the daily slogan from Mao's little red book- of the terms 'ethnocentric' and 'racist' as applied to any observer who considers the possibility that similar developments in separate cultures may not have arisen from a common derivation; particularly in those past cultures too remote in time for any absolute truth to ever be established as to their motivations.
We do however in contemporary times have examples of how cultural changes occur:
Abstraction in painting, is an excellent example. While there were occasional experiments in abstraction in Europe early in the 20th century- Malevich, Kandinsky, Mondrian..., it was not until the 1940's in New York that the concept of abstraction took root; became the major impulse in modern art which was echoed on every continent for a brief spell. Similar influences can be observed in regard to the development of Impressionism in Paris a century earlier.
What these examples suggest is that there is a common latent awareness in certain human beings in differing locations at roughly similar times, but that conditions for a 'full flowering' usually only occur at one particular point; after the full flowering it is- as 'morphic resonance' suggests- easier for replication[ albeit always with subtle local overtones ]everywhere.