A Small Marine Amphipod Has Recently Been Discovered That Carries

question 39

Multiple Choice

A small marine amphipod has recently been discovered that carries another organism on its back. The "backpack" organism tastes bad. If a fish ingests the pair, it immediately spits them back out. If the amphipod is alone, however, it is readily eaten and swallowed. There is no apparent benefit in this relationship for the "backpack" organism, which appears to be neither helped nor harmed. This is therefore a case of

• A) mutualism.
• B) parasitism.
• C) commensalism.
• D) competitive exclusion.
• E) predation.

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Definitions:

Economic Life

The estimated period over which an asset is expected to be useful and generate revenue, differing from its physical life.

Off-Balance Sheet Financing

Off-Balance Sheet Financing is a financial obligation that is not directly recorded on the company's balance sheet and is used to keep debt-to-equity ratios low and improve financial indicators.

Operating Expenses

Costs associated with a company's main operational activities, excluding cost of goods sold, financing costs, and taxes.

Income Statement

A financial statement that shows a company's revenues and expenses over a specific period, resulting in the net income or loss for that period.