Pablo neruda suggested it with the images of <span>darkness and shadow. The darkness and shadow in pablo neruda's sonnet 17 refers to the defect that the beloved have. By saying that 'I love you as certain dark things are loved', it's indicate that the speaker acknowledge the deffect that the beloved have and still accepted her love unconditionally.
The equal environment assumption is a biometric model that predicts how far the monozygotic twins are correlated to each other upon their exposure to environmental effects which are of etiologically significance to the trait/traits under consideration.
