 These nature-nurture sciences entail not only different methods but also different control of materials and conditions, so, in practice, results are difficult to translate from one of them to the next. Discussion of the nature-nurture debate (even in critical accounts where nature and nurture are said to interact or shape each other) signifies, among other things, that the specialness of the conditions involved in the original formulation and demonstration of the genotype-phenotype distinction may be overlooked. As a consequence, for example, control of materials and conditions that is practical in laboratory and agricultural breeding gets built into evolutionary thinking when the latter uses models and terms from breeding as if there were also a selector in naturally variable populations. 