Dissociative disorder involves the existence of two or more distinct personalities in the same individual, along with severe memory disruption.

Dissociative identity disorder involves the existence of two or more distinct personalities in the same individual, along with severe memory disruption.

Explanation:

Dissociative identity disorder (formerly known as Multiple Personality Disorder) is a complex psychological condition characterized by the fragmentation of a person's identity into two or more personalities, this dissociation acts as a coping mechanism for the patient. Other symptoms of this disorder are changes in perception, behavior and memory gaps. The causes are not fully determined as it can be multifactorial but is frequently linked to severe sexual and physical abuse during early childhood (before 6 years old).

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the median of the data is 4.

step-by-step explanation:

the median means the middle number of a given number.

to decide which one is the median, arrange in ascending or descending order. but sometimes, you may find two(2) number in the middle, but it's easy, just add them together and divide by 2.

so,   determine the median of the data. 2, 3, 3, 4, 5, 7, 9

it is already arranged, count 3 times forward and 3 backward and the one left is your answer.

2,3,3,4,5,7,9

our answer is 4.

hope this !

d. the polar jet stream   lies between the polar easterlies and trade winds should be your answer