is the knowledge that objects exist even when they cannot be seen. Babies master this concept when they begin to develop mental representations around the age of 18 to 24 months.

How important is it to have a powerful army and navy? give two reasons for your answer

Sariah enters a room with several chirping crickets in it. upon first entering the room, sariah can hear the chirping; however, as she begins to talk to her friends, she is no longer aware of the chirping even though it is still there. the fact that sariah no longer perceives the chirping sound demonstrates sensory

True or false: the eastern roman empire lasted for 1,000 years longer than the western roman empire.