4 ms·
Species is not a well-defined term in the sense a mathematician understands well-defined. E.g. the usual "ability to breed and create fertile offspring" exclude
by Tloewald 10y ago
Species is not a well-defined term in the sense a mathematician understands well-defined. E.g. the usual "ability to breed and create fertile offspring" excludes all organisms that do not reproduce sexually, and does not account for fertile hybrids and "ring species".