Overview of Human Evolution
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The opposing theory holds that modern humans evolved "in parallel
from several dispersed Homo erectus populations at roughly the same time over a period from 400,000 to 300,000 years ago. The arrows suggest that some intermingling of these regional populations was going on. This theory is supported by the fossil evidence, which shows many intermediate forms and some continuity in the characterstics of regional populations, such as shovel-shaped incisors in Asian populations from Homo erectus to modern humans.
