Professor Anderson studies memory in people who have had strokes. Professor Schmidt studies people who claim to have clear memories of events that happened over three decades ago. Such research on the extremes of memory:A. helps us to understand how memory works.
B. explains how consciousness works.
C. is not useful to psychologists who study normal memory.
D. makes us realize that it is impossible to study memory.

The correct option is A) helps us to understand how memory works.

Explanation:

The scientists today have different theories relating to the functioning of the brain and mind as well as how various thoughts, memories etc arise in a person. There are various psychological theories on the functioning of the mind and all of them can be supported in various ways and can be disregarded in many other ways. Researchers tend to study various minds of people and actions to understand how memory works.

  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.

you probably know the answer. stop asking stupid questions and making me waste my time. j.k. ; )   b.t.w. what are three ratios equivalent to 5 : 11? thx