Answer: Studies of identical twins:
- proved conclusively that human development is a result of the interaction between environmental and biological factors.
Step-by-step explanation:
Epigenetics is a regulatory system that controls the expression of genes without affecting the composition of the genes themselves. The regulation of genetic transcription has emerged as a key biological determinant of protein production and cell differentiation, and plays an important pathogenic role in a number of human diseases. It refers, in a broad sense, to the study of all those non-genetic factors involved in the determination of ontogeny.
Therefore, understanding it ,will be a key piece to unveil the interaction between external agents, lifestyles and cellular physiology. In this sense, almost identical twins are a great opportunity to study it.