Etiquette refers to a person's behaviour and attitude
C. Various groups of people united as one social class
The industrial revolution amplified food production it also had an effect on the increase of city population
The modification in rules to allow unpaired men to propose their own choice girl cannot affect the algorithm of pairing outputs.
Explanation:
As it is the 21st century, each and every woman knows her rights, good and bad. As men are only allowed to propose in this scenario, they can not compel women to be their partners. So it is totally up to women either proposed girl or woman goes to that man or not it is totally up to her. So this modification has no symbolic effect on the pairing algorithm.
I think it is the cell membrane, but there is a possibility it is the cell wall. I think the cell membrane is correct because the skin does allow certain things into your skin cells, such as water. Similarly, cell membranes allow certain things in the cell. The cell membrane basically acts as the security guard of the cell.
