Mark just bought a brand new Subaru hybrid after driving a twenty-year-old car for a long time. He is really impressed with his new car and takes every opportunity to drive his friends around in it. Over the next year, three of his friends buy new Subarus and three others are seriously considering doing so. Which concept best describes what is happening in Mark's network?

Contagion

Explanation:

Contagion  is the phenomena through which a emotion, attitude,behavior etc is spread from one person to other person or group of people.This spread can be based on rumors, agenda, thought, point-of-view , suggestion,act of imitation etc.

According to the question,situation of Mark and his network of friends is depicting about contagion as his friends are buying he same car which Mark has bought and other three friend are also interested to buy it .Thus, the similar car buying network is established.

answer: hey improve the marine life in a certain area.

they provide a new location for fishermen to fish and which works to ease the pressure on natural reefs.

they are a great way to get rid of large objects that would otherwise be placed on landfills

explanation:

send them to therapy or somthing like that