Four Years Ago,89-Year-Old Hyrum Began Experiencing a Falloff in Cognitive

question 63

Multiple Choice

Four years ago,89-year-old Hyrum began experiencing a falloff in cognitive performance.This is a sign of

• A) a loss of vitality and impending death.
• B) preservation of cognitive resources.
• C) disuse of particular skills rather than biological aging.
• D) the irreversibility of age-related declines.

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Definitions:

Dizygotic

Pertaining to twins that are born from separate eggs fertilized by separate sperm cells, resulting in them being genetically similar as siblings rather than identical.

Monozygotic

Referring to twins that are genetically identical because they were formed from a single fertilized egg that split into two.

Chromosome

A thread-like structure made of protein and a single molecule of DNA, found in the nucleus of cells, carrying genes that determine inherited traits.

Genetic Action

The process by which genes influence traits or behaviors.