Achild is playing at the beach. she pours an equal amount of sand into both a short, fat container and a tall, thin container. when asked which container holds more sand, the child points to the tall, thin container. this response suggests that she is most likely in the stage of cognitive development.

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.