Final answer:
The causes of disordered behaviour are multifactorial and include a blend of genetic, environmental, and psychological factors, influenced both by innate genetic predispositions and learned behaviours shaped by cultural and social environments.
Step-by-step explanation:
The causes of disordered behaviour are multifactorial, involving a combination of genetic, environmental, and psychological factors. In looking at this from a more evolved perspective, we see that as animals rise higher on the evolutionary scale, learned behaviours become increasingly significant. However, innate behaviours rooted in our genetics still play a crucial role in humans, as demonstrated by our tendencies to form in-groups and seek approval. Environmental factors such as cultural pressures can shape the specific criteria for such social behaviours. Moreover, nervous system disorders suggest that both nature (including genetic mutations) and nurture (like emotional trauma and stress) contribute intricately to disordered behaviour. More complex behaviours intertwined with psychological and social constructs also hold evolutionary significance, having developed as adaptations to our surrounding physical and social environments.