Salmon Eggs Hatch in Fresh Water

question 6

Multiple Choice

Salmon eggs hatch in fresh water. The fish then migrate to the ocean (a hypertonic solution) and, after several years of feeding and growing, return to fresh water to breed. How can these organisms make the transition from fresh water to ocean water and back to fresh water?

• A) The rectal gland functions in the ocean water, and chloride cells function in fresh water.
• B) The salt transport mechanisms of the gill epithelia change during migration.
• C) Salmon in fresh water excrete concentrated urine, and salmon in salt water secrete dilute urine.
• D) Their metabolism changes in salt water to degrade electrolytes.

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Definitions:

Linear Programming

A mathematical methodology for determining the best outcome in a given mathematical model for some list of requirements represented as linear relationships.

Constrained Resources

Resources in limited supply that restrict the ability of an organization to produce goods or services or achieve desired outcomes.

Linear Programming

A mathematical modeling technique used for optimization of a linear objective function, subject to linear equality and inequality constraints.

Sensitivity Analysis

A technique used to determine how different values of an independent variable will impact a particular dependent variable under a given set of assumptions.