When Geese or Ducks Are Imprinted, This Means That They

Multiple Choice

When geese or ducks are imprinted, this means that they ____.

A) will return to the place they were born to breed and raise their own young
B) have become habituated to harmless stimuli
C) have been experimentally trained by operant conditioning
D) learned the features of a suitable mate during a critical period
E) have two nonfunctional copies of a particular gene