The genes for amyloid precursor protein, presenilin 1, and presenilin 2 account for over 50 percent of all Alzheimer's cases

Which of the following statements is the most accurate with regard to life expectancy?

a. There is no single trend about gender differences for life expectancy that can be generalized to the entire world, because nearly every country shows different patterns of life expectancy based on lifestyle choices. b. On average, men outlive women by 3 years throughout the world, but women outlive men by 2 years in the United States. c. On average there is no difference in life expectancy between men and women throughout the world, however in the United States men outlive women by 5 years. d. On average women outlive men by four years throughout the world, and by 5 to 6 years in the United States.

When a parent wants a young child to look at something on the floor, the phenomenon called joint visual attention says that the parent should __________

a. point to the object b. look at that object c. set the baby down in front of the object d. lift the baby up so that (s)he is looking down at the object.