How Do Ray-Finned Fish Keep from Sinking

question 56

Multiple Choice

How do ray-finned fish keep from sinking?

• A) They are constantly swimming.
• B) Their fins are constantly moving.
• C) They have lungs that are always filled with air.
• D) They have a swim bladder that is filled with gas.
• E) They have a skeleton that is less dense than the surrounding water.

---

Definitions:

Higher-order Conditioning

A process in classical conditioning by which a stimulus that's associated with a primary conditioned stimulus also becomes a conditioned stimulus.

Stimulus Discrimination

The ability to differentiate between one stimulus and similar stimuli, ensuring that only the original stimulus triggers the conditioned response in classical conditioning.

Stimulus Discrimination

The ability to differentiate between similar stimuli and respond appropriately to each one.

Conditioned Stimulus

A conditioned stimulus is a previously neutral stimulus that, after being repeatedly paired with an unconditioned stimulus, begins to evoke a conditioned response.