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Using both eyes allows us to have depth perception, where having only one eye would not allow it.

Dissociative amnesia involves different personalities.

During REM sleep, voluntary control of the large muscles is lost, perhaps because this:

Joe had a lot on his mind and was always distracted. He was constantly forgetting where he put his keys. This would be an example of 

Studies show that following a trauma, the amount of support an individual may get from family and friends will have little to no effect on them developing PTSD. 

All of these but one have been found to help improve memory.

In the center of the retina there are no rod and cones. What causes this?

Marissa went to a movie yesterday, and when her friend asked her what she did yesterday, she could remember going to the movie easily. This is an example of 

If you had only rods and no cones in your eyes, you would be unable to see

When the bird sings outside Carrie’s window, Carrie can hear the bird 50% of time when it is singing. This would be an example of