Which Class of Galaxies Has the Greatest Range of Sizes

question 52

Multiple Choice

Which class of galaxies has the greatest range of sizes in the universe?

• A) irregular galaxies
• B) ellipticals
• C) lenticular galaxies
• D) spirals

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Definitions:

Stimulus Substitution

A theory in classical conditioning suggesting that the conditioned stimulus acts as a substitute for the unconditioned stimulus, eliciting the same response.

Classical Conditioning

An educational mechanism where the consistent pairing of two stimuli occurs; the response which initially is drawn by the second stimulus, in time, is drawn by the first stimulus alone.

Conditioned Stimulus

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

Conditioned Fear

A learned response to a previously neutral stimulus that has become associated with a frightful event or situation.