A kid grows up and has a life, L, that bears a strong historico-cultural stamp. Was it nature or nurture the foolish ask.

Not that the question is poorly motivated, and the problem is not that the social-cultural forces that had such demonstrative effects are, or are not, real. The problem is that there is no nature-only version of L to be found. There is no way to construct nature that is not from a contingent, fully enculturated, position.

A person does not remain a seed.