The following diagram shows a stage of a cell during mitosis. Which of the following happens to the cell during the stage shown in the diagram?

The chromosomes are replicated.
The chromosomes start to condense.
The centromere of each chromosome splits.
The centrosomes line up in the middle of the cell.

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.