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What scientifically, socially and logically plausible mechanisms allow two (or more) sapient land-based species (either closely placed on the phylogenetic tree, such as Homo sapiens and Homo neande...
What scientifically, socially and logically plausible mechanisms allow two (or more) sapient land-based species (either closely placed on the phylogenetic tree, such as Homo sapiens and Homo neande...