When a Star Is Just Evolving Off the Main Sequence,which

question 30

Multiple Choice

When a star is just evolving off the main sequence,which element is most common in the core?

• A)Hydrogen
• B)Helium
• C)Carbon
• D)Iron
• E)Depends on spectral type

---

Definitions:

Reinforcer

Any stimulus that strengthens or increases the likelihood of a specific response or behavior by being applied as a consequence of that behavior.

Discriminative Stimulus

A stimulus in the presence of which a particular response will be reinforced or punished, leading to an increase or decrease in the occurrence of that response.

Negative Reinforcer

An unpleasant or aversive stimulus that, when removed or avoided after a behavior, increases the likelihood of that behavior occurring in the future.

Unconditioned Stimulus

A stimulus that naturally and automatically triggers a response without any prior learning.