Explain debates about where humans originate.

There are two theories about the origin of modern humans; the out of Africa view argues that genes in the fully modern human all came out of Africa and there was no interbreeding involved and the alternative model; a multi-regional view that argues how all human population flowed between different regions and mixed together which contributed to the development of the modern human. What makes these theories the most highly debateable in paleoanthropology is that 30,000 years ago, the taxonomic diversity previously seen amongst homo sapiens, homo erectus and homo Neanderthals had vanished and humans everywhere had evolved into the anatomically and behaviourally modern form; there is much deliberation as to how this occurred which rose this differing schools of thought; one that emphasises multiregional continuity and the other that suggests a single origin for modern humans. In order to understand this controversy, the archaeological, anatomical and genetic evidence needs to be evaluated.
The Out of Africa theory hypothesizes that modern humans originated in Africa over 100,000 years ago and replaced the world's archaic human species such as Homo Erectus and Neanderthals, after migrating within and then out of Africa to the non-African world within the last 50,000 to 100,000 years which involved a leading proponent of Chris Stringer. This view is highly accepted among both archaeological and anthropological academics as they do support the notion that archaic Homo populations did leave Africa in an initial phase of globalisation, called the Out of Africa 1 model. In a follow up to this, the population replacement hypothesis indicated that modern humans evolved in Africa from the ancestral hominids that did not travel out of this continent in the first stage of global colonisation. It is then argued in this model that once evolved as anatomically modern humans, Homo sapiens travelled out of Africa to explore, colonise and replace the archaic Homo population. This