In studies on human fetuses, habituation was demonstrated as early as 30 weeks. When scientists studied fetuses at 38 weeks, they noticed a change in habituation. Which of the following statements best summarizes the change they noticed in the older fetuses?
A. Older fetuses were less likely to demonstrate habituation to a repeated stimulus.
B. Older fetuses were unable to habituate at all to a repeated stimulus.
C. Older fetuses demonstrated sensitization instead of habituation.
D. Older fetuses displayed habituation for a longer period of time than 30-week-old fetuses.
Answer: D
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