Which processes contribute to the formation of chemical sedimentary rocks?

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organisms decay in a solution.
minerals dissolve and crystalize.
rock fragments squeeze together.
the remains of plants and animals.

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of