Genetic factors have their greatest impact on Parkinson's disease in cases that involve ____.
a. early onset of the disease
b. late onset of the disease
c. first-born children
d. children with older brothers and sisters
Question 2
A particular area of a songbird brain grows under the influence of testosterone; hence, it is larger in breeding males than in females or immature birds. That brain area enables a mature male to sing. What type of explanation is illustrated here?
a. evolutionary
b. ontogenetic
c. neurological
d. physiological
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