Answer:
Ellie is an eight-year-old girl who lives in a Western country in a large metropolitan area. If one were to compare Ellie to her mother, grandmother and great-grandmother in regards to onset of puberty, one would predict that Ellie will experience puberty younger than others did in her family lineage.
Step-by-step explanation:
Signs of puberty (breasts and pubic hair in girls and enlargement of the testicles and pubic hair in boys) may appear from age eight in girls and from age nine in boys, but puberty used to appear later in the past.
Many people believe that puberty has arisen early in children (compared to the age at which their parents and grandparents entered puberty) due to the troubled environment of big cities. Since Ellie is an eight-year-old girl who lives in a western country in a large metropolitan area, we can conclude that the bustling environment of metropolitan areas can influence Ellie to experience the puberty younger than others did in her family lineage.