Zebra finches and white-crowned sparrows are __________ birdsong learners; canaries are __________ birdsong learners

A mother pours each of her two children a cup of chocolate milk. Although each cup holds the same amount of liquid, one is taller and skinnier. The child who does not receive the tall, skinny glass starts crying because she is convinced that her brother received more chocolate milk than she did. Which cognitive developmental concept does this child have trouble understanding?

a. Reversibility b. Centration c. Conservation d. Classification

If Natalie and Jenna are in the Friendship as Mutual Trust and Assistance stage of friendship, which of the following descriptions would apply?

A) Their relationship has become more complex and psychologically based. B) Their friendship does not have any type of enduring quality. C) A rift in their friendship would not require an apology or explanation. D) Only an extreme falling out can terminate their friendship.