Can plants and animals form sedimentary rocks?

Yes, sedimentary rocks are forming all the time. If a plant or animal falls into the sediment it will be covered by more sediment and become part of the rock. Sometimes whole rocks are made out of plants or animals. Coal for example is mostly vegetation that has accumulated over long periods of time. read more

Plant and animal fossils are found in sedimentary rocks, but in most cases they don't form the rocks themselves. Sedimentary rocks are formed from wind- or water-borne particles of mineral matter that are laid down in horizontal layers. Plant or animal remains may become mineralized in these layers, forming fossils. read more

Yes. Many types of limestone are formed from the shells of variousaquatic animals. Coal is commonly formed from plant matter. read more