Jordan tries to search for her favorite pacifier after her brother hides it under the couch. this shows that jordan has developed a sense of:

Object Permanence

Explanation:

Object permanence is used to explain the tendency of an infant to recognize that objects still exist, although they can not be seen or heard any longer.

Whenever an item gets hidden from sight, infants within a certain age are often get upset that the item has disappeared.

Jordan thinks that her pacifier has disappeared.

This is because they're too young to really understand that although the object can not be seen, it still exists.

i dont know sorry why dont you looking it up on google