Most Fishes Can Either Live in Freshwater or Live in Saltwater

question 67

Multiple Choice

Most fishes can either live in freshwater or live in saltwater habitats, but not in both. If you move a marine fish from the ocean to a lake, it will quickly die, and vice versa. However, a small number of fish species are capable of moving between the two environments. Salmon are osmoregulators that hatch in rivers, spend most of their lives in the ocean, and return to the river where they were born in order to breed.
-When a salmon moves from the ocean to a freshwater environment, you would expect its urine volume to ________ and its rate of salt absorption to ________.

• A) increase; remain the same
• B) increase; increase
• C) decrease; decrease
• D) decrease; increase

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Definitions:

Motor Stimulus

A physical or psychological factor that induces a motor response or activity in an organism.

Imprinting

A kind of swift and irreversible learning that occurs at a particular life stage, usually early in life, leading to a long-lasting behavioral response to a specific individual or object.

Coordinate Movements

The ability to use different parts of the body together smoothly and efficiently in physical actions.

Classical Conditioning

Classical conditioning is a learning process wherein a neutral stimulus becomes associated with a meaningful stimulus, leading to an automatic response.