Scientific research confirms that modern humans coexisted with other ancient human species. These species include Neanderthals, Denisovans, Homo naledi, Homo floresiensis and Homo erectus. These groups interacted and interbred with Homo sapiens. Neanderthals and Denisovans genes are woven into modern human DNA. This interbreeding helped humans adapt to new environments. The findings highlight a broad family of ancient human groups.