When babies are born, they can turn their heads in the direction of interesting sounds

Ahmed used to love taking long walks around the lake near his home. Recently, the world seemed to be spinning around him on his walks—so now Ahmed sits in a chair and enjoys the scenery. Which of the following caused Ahmed to give up his lakeside walks?

a. vertigo b. somasthesia c. presbycusis d. dizziness

By using energy-efficient lights, Don has reduced the volume of greenhouse gases he adds to the atmosphere, and by doing so he immediately sees a reduction in his

a. conservation factor. b. carbon footprint. c. ecological debt. d. BMI footprint.