Rough-and-tumble play
A) is more common among girls than among boys.
B) is completely unique to humans.
C) peaks in the preschool years, then declines during adolescence.
D) seems to originate in parents' physical play with babies.
Answer: D
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Fifteen-year old Stephanie is having difficulty remembering how to spell the word "definitely" for an upcoming quiz in her English class. She can't remember whether it is "definitely" or "definately.". She thinks about it for a moment and decides that the easiest way to remember is that the word has one prefix ("de"), one root word ("finite"), and one suffix ("ly"). By separating the root word,
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