Which visual elements do achromatic and monochromatic schemes rely on to make them more interesting?

Can be made more interesting by varying the types, sizes, forms and textures of white flowers.

Explanation:

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grunge  bands  such as nirvana, pearl jam, soundgarden, and alice in chains broke into the mainstream, achieving commercial chart success and widespread exposure. punk revival  bands  like green day and the offspring also became popular and were grouped under the "alternative" umbrella.