According to the article Who's Old First about physical declines in old age, a few skills peak later than others. It was suggested that those peaking later might have required more:

Connectomics is an approach that scientists use to visualize

A) connections between neurons. B) biological connections between fraternal twins. C) emotional connections between child and caretaker. D) connections between genes.

"Brains," "jocks," "populars," and "druggies" are typical examples of teenage

A) cliques. B) crowds. C) clubs. D) nicknames.