In agricultural societies, children typically socialize into more distinct gender roles than do children in nomadic societies. this best illustrates that gender-role differences between social groups result from
1. cultural influence.
2. a pruning process.
3. natural selection.
4. individualism.

1. Cultural influence.

Explanation:

In agricultural and feudal societies gender roles were clearly distinct than the tribal and nomadic societies. Agricultural societies were mixed in to the mainstream world but they follow the gender disparity from childhood and they delineate the roles between the girls and boys and restrict the with in inner circle. Nomadic societies lived in seperate region and they voluntarily isolated from mainstream society and gender disparity is less when compared to agricultural societies. Industrialisation and urbanisation reduced the gender disparities and maintain the gender equalities.

answer; cultural trait;

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.