Experience , Power and Knowledge is not required to show the bravery. But clearly, 'bravery is a quality exhibited only by a person who possesses courage.

A book can be without Chapter, Illustrations, contents and Pictures. Page is required to constitute a book. So Page is mandatory component for books.

A clock can be without battery, Frame, Alarm and Numbers. Without Needles , we can not form a clock.

A car can be without Bumper, Dicky, Bonnet and Driver. A car must have wheels.

A Tree can be without Leaves, Shadow, Fruits and Branches. A tree cannot be a tree without Roots.

NA

A scenery can be without Painter, River , mountains and Paints.
A scenery can be with composition of many things. So composition is the mandatory for Scenery.

A cupboard can be without clothes, bolt, locks and door.

NA

Newspapers always contains news. Newspaper can be without Editors, Date and Paper.