Yes. However, they first record the songs and then choreograph and film the episodes.
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Yes, the actors on Glee performed their own vocals for the show. They underwent extensive vocal training and recording sessions to prepare for their musical performances on the show.
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Plants don't excel in locomotion, that is, the ability to move on their own. They show a sensitivity to external stimuli, such as food, by consuming it.
Risking your own life means that you have put your own life in danger. One could say that firefighters who rush into burning buildings to save people trapped inside have risked their own lives to save others.
The three properties of air that show it is a mixture are: (1) uniform composition, (2) components can be separated by physical means, and (3) each component retains its own properties in the mixture.