An infrared ray can be use be used to .
A. dignose problems with utility lines
B. correct problems with heating food
C. amplify a radio broadcast
D. gather data about speeding cars

D

Explanation:

the best answer for these questions would be:

1.            c. is smaller

2.            d) concrete operational

3.            b) interaction with the environment – the children interact with their environment can them learn more.

4.            a) parents who reason openly with children can limit a child’s cognitive ability.