Which of the Following Would Be Considered a Commensalistic Relationship

question 2

Multiple Choice

Which of the following would be considered a commensalistic relationship?

• A) Some species of crabs decorate their shells with sea anemones and other corals. These "decorations" help camouflage the crab, and the movement of the crab from one area to the next exposes the corals and anemones to different sources of food.
• B) Some spiders do not build webs, but live in the web of another species. When a prey item is caught in the web, the non-web building spider will sneak in and steal the prey.
• C) A praying mantis hunts and eats a fly.
• D) The longest tapeworm removed from a human was approximately 11 meters long. Tapeworms do not have a digestive system, but obtain all of their nutrients from the host.
• E) Pseudoscorpions are small, harmless arachnids. To move from one place to another, they will sometimes latch onto the legs of flies and thus be carried long distances that they would not readily be able to traverse.

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Definitions:

Interdependence

A situation where entities are dependent on each other, often observed in global economies where countries rely on others for resources, technology, or markets.

Price Takers

Firms or individuals who accept the market price as given and have no influence to alter the price of the good or service they are selling or buying.

Four-firm Concentration Ratio

A measurement that indicates the combined market share of the four largest firms in an industry, used to assess the degree of competition within the market.

Herfindahl Index

A measure of market concentration that is used to determine the amount of competition among firms within an industry.