Russian novelist Leo Tolstoy once wrote, "We do not love people so much for the good they have done us as for the good we have done them." This quote is most closely related to the concept of

A researcher is interested in how the scores that children receive on a spelling test are affected by the amount of food that they eat for lunch. The independent variable is

a. the age of the children. c. the words on the spelling test. b. the scores on the spelling test. d. the amount of food eaten for lunch.

Apraxia is characterized by

a. motor paralysis. b. an impairment in learning a new motor skill. c. muscle weakness. d. the inability to properly carry out a learned, skilled movement. e. an impairment in motor coordination.