In the graph above you can see how heart disease begins to rise quickly as a leading cause, hitting a high mark in the 1960's, and then begins a steady decline, especially after mid-1990. Why do you think this is?

In a search a driver needs to look in a of distances far away to near, as well as to the left, right and rear of the vehicle, making efficient use of both central and fringe vision. a) fast manner b) systematic manner c) slow manner d) aggressive