GENERAL KNOWLEDGE: Give approval or sanctin to something?

Questions

If a bear lives in the southern hemisphere, the opening of the cave in which he hibernates is always on which slope?

If a pope has not been elected, what color smoke is seen?

If a robin's egg is put in vinegar for thirty days, what colour does it become?

If an animal has feathers, what is it?

If an animal has gills, what is it?