do fish sleep?/which 2 colors combine to make yellow?

Yes fish sleep. They have a day and a night just like we do.

No two colors make yellow because it's a primary color. Primary colors make secondary colors, but not vice versa.
 
yes fish do sleep but they pretty much just stay still and thats when they are sleeping. and yelllow is a primary color but with paints and stuff you can mix red and orange and get yellow
 
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