The principle of _____ helps explain why a person with only one ...

[cnetterville]

The principle of _____ helps explain why a person with only one visual pigment can see all wavelengths as the same color (i.e., shade of gray) if light intensity is adjusted appropriately.
 
  A) intensity
  B) adjustments
  C) univariance
  D) unitization

Question 2

Computer databases such as PsycINFO are searched using
 
  a. primary terms.
  b. secondary terms.
  c. keywords.
  d. journal abstracts.

[firehawk60]

Answer to Question 1

C

Answer to Question 2

c

[cnetterville]

Great answer, keep it coming

[nathang24]

Gracias!