Which of the Following Would Be Considered a Mutualistic Relationship

question 24

Multiple Choice

Which of the following would be considered a mutualistic 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 hunting and eating a fly.
• D) The longest tapeworm removed from a human was approximately 11 meters long. Tapeworms do not have a digestive system, but obtains 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:

Income Elasticity

A measure of how much the demand for a good or service changes in response to changes in the consumer's income.

Midpoint Method

A technique used to calculate the percentage change between two values, avoiding the problem of path dependency by using the average of the initial and final values as the base.

Normal Goods

Goods for which demand increases as the income of individuals increases.

Income Elasticity of Demand

A gauge for the sensitivity of demand for an item to shifts in the income levels of buyers.