At Halloween, Gregory puts on a scary mask that makes him look like a zombie. His 3-year-old brother Dennis is petrified, believing that Gregory has become a zombie. Dennis has not yet mastered the concept of
A) classification.
B) conservation.
C) representation.
D) reversibility.
Question 2
Three-year-old Ceres is playing with her toy farm. She has 15 cows, 3 pigs, and 2 horses. When her older brother asks whether there are more cows or more animals, she happily yells out, more cows Ceres has not yet mastered the concept of
A) classification.
B) conservation.
C) representation.
D) reversibility.
Chinese workers on a railway in the far West. “Without them,” Leland Stanford, president of the Cent
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