The "Star" That Is Seen at the Center of a Planetary

question 221

Multiple Choice

The "star" that is seen at the center of a planetary nebula is

• A) a small, hot, and very dense white dwarf star.
• B) composed almost entirely of neutrons and spinning rapidly.
• C) the accretion disk around a black hole.
• D) a planet in the process of formation.

---

Definitions:

Observational Models

Learning through observing the behaviors of others and the outcomes of those behaviors, also known as social learning.

Operant Chambers

Enclosures used to study animal behavior through operant conditioning, featuring mechanisms for delivering reinforcements and punishments.

Conditioned Stimulus

A previously neutral stimulus that, after being paired with an unconditioned stimulus, evokes a conditioned response.

Operantly Conditioned

A type of learning in which the strength of a behavior is modified by the behavior's consequences, such as reward or punishment.