Q: Fact 1: Gills are used for breathing water by aquatic animals. Fact 2: All fish have gills . Given the two facts above, what do all fish breathe?

Options:
[A]. oxygen.
[B]. lipids.
[C]. air.
[D]. keratin.
[E]. water.
[F]. seaweed.
[G]. mud.
[H]. lava.
A:
[E].