Parents' motherese, or child-directed speech,
a. quits abruptly when the toddler begins to use grammar.
b. gradually includes more complex sentence constructions as the child improves language competencies.
c. is triggered by hormonal changes in the mother's body.
d. is flatter in vocal tone than adult-to-adult speech.
Question 2
Longitudinal research is like
a. a one-day trip with children to Disneyland.
b. filling out an income tax form.
c. shopping for bargains at different shops.
d. noticing how grandchildren have grown when they visit in successive years.
Genetic analysis begins with mutants
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