Why might a child thinking at the concrete operational level have difficulty with X + Y = 7?
a. S/he cannot think of two dimensions at the same time.
b. S/he cannot think abstractly.
c. S/he cannot think logically.
d. S/he cannot use conservation.
Question 2
When given a ___________________ _, 3-month-olds remembered how to move the mobile after a 28-day delay.
Fill in the blank(s) with correct word
