The correct answer is mutualism
Explanation: Mutualism is an ecological relationship between individuals of different species in which everyone involved benefits. It may be mandatory or not.
Answer:
A. High entry costs prevent new producers from entering the market.
Explanation:
Oligopoly is the opposite of monopoly (only one company that offers a service or is the supply). An oligopoly has few companies offering one service or product which can control the supply and market price of it, such as automotive sector or airline. One of the things that limited competition in an oligopoly is the costs of entry, to set up the manufacturer, to make research and marketing and be able to compete with these companies the entry cost is high.
The Roman society was divided into two groups, the Patricians, and the Plebians.
The Patricians was a class full of descendants and consisted of the most powerful and noble families.
The Plebians were mainly artisans or peasants who worked for the Patricians' lands.
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