Экспериментаторы исходили из предположения, что, если близнецы однояйцевые, все различия, возникшие впоследствии, следует отнести за счет разной среды обитания.
Experimentalists have proceeded from the assumption that, if identical twins, all differences arising subsequently, should be attributed to the different habitats.
Experimenters have proceeded from the assumption that if the twins are identical, any differences that have arisen subsequently, it should be attributed to the different habitats.
the experimenters were based on the assumption that, if the twins are identical, differences emerged later, should be attributed to the different habitats.