Which of the following is an opponent mechanism proposed by Hering?
A) Black (+); White (-)
B) Red (+); Green (-)
C) Blue (+); Red (-)
D) Black (-); Yellow (+)
Question 2
Which of the following is a set of principles that explains and predicts many, but not all, observed relationships within a given domain?
a. A tautology
b. A research hypothesis
c. A theory
d. A deduction
