they had opposing views as to whether or not slavery should be legal in the west.
Since, Sally, a nine-month-old can retrieve her ball when her mother hides it under a blankets, she has known Object Permanence.
<h3>What Is Object Permanence?</h3>
Object permanence serves as a term that describes the understanding of how items and people still exist even when one can't see or hear them.
Therefore, since the girl can know where the ball was hide , she was mastering Object permanence.
Learn more about Object Permanence at;
brainly.com/question/5589531
to understand this, i need some context please