The correct answer is listening. It is because listening is involve between the speaker and the audience member in which as the speaker speaks about what he or she would like to share, the role of the audience member is to listen to the speaker and by this, they are likely to fulfill and complete both of the parties' transaction.
I think human societies are characterized more by competition because, in terms of surviving, nowadays, there are more living creatures than food, therefore, there are some people who will starve to death if they won't strive hard to have food to eat. The competitiveness of the humanity is not only measured in terms of surviving but also in other social sciences like economics, politics, and others, which could also relate to the needs and wants of each human.
It is the ipomoea quamoclit flower.
