The hormones which stimulate the growth of ovaries in girls and testes in boys are

Which of the following explains why, after staring at a light bulb, we tend to see a shadow floating in front of our vision when we look away?

a) the opponent-process theory b) the trichromatic theory c) the signal-detection theory d) the gate control theory

The vestibular system monitors

a. body orientation and its changes. b. hearing. c. visual acuity. d. temperature sensations.