Which of the Following Would Be Considered a Mutualistic Relationship

question 28

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 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:

Discount Rate

The interest rate the Federal Reserve charges commercial banks for short-term loans, or a rate used to discount future cash flows to their present value.

IRR Method

The Internal Rate of Return method, a capital budgeting technique that calculates the rate of return at which the net present value of all the cash flows (both positive and negative) from a project or investment equals zero.

Nonconventional Flows

Atypical or irregular cash flows in an investment, complicating the assessment of an investment's value or project's profitability.

Profitability Index

A calculation that measures the relative profitability of an investment, by dividing the present value of future cash flows by the initial investment cost.