According to the article Old Folks at Home, concerning the ability of older people to perform household tasks, if an older person replaces an activity they can no long do with another activity, the person has used:

Frank and Joe are 55-year-old monozygotic twins. Since their genes are identical, according to research, how will they age?

They will age identically. They will age very similarly. If one shows minor variations in ability, so will the other. One can show much variation in ability and the other may not.

The notion that human language production is controlled primarily by the left cerebral cortex was first proposed by __________

a. Paul Broca b. Sally Shaywitz c. Karl Wernicke d. Hermann Ebbinghaus