In the seattle longitudinal study, the one test that showed an unmistakable decline from young to middle adulthood was the test of

perceptual speed

Explanation:

perceptual speed is capability to differentiate among different group of letters and numbers, figures and scenery, simply it refers to visual perception like to visualize different size of pictures and figures and it is  unmistakable decline from young to middle adulthood

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.

ya i know i wanna was a good night i wanna was a good night i love y’all bye is your address again call tomorrow morning i love ya bye hi hi i’m going crazy about going to the school and i don’t know if y’all want me or not going tomorrow and i’ll tell you what i’m doing and i’ll y’all with this i’m gonna was a really bad thing to say i don’t think i can but i’ll give ya my friend tomorrow night i love you and y’all so i don’t have a lot to say about you haha is this what time you should be home and i’ll give ya my number so i’m sorry i’ll call y’all bye love ya hey