Plaster of Paris.
Bones can decay like any other organic material. Sometimes, however, bones can be preserved in rock - those are called fossils.
yes
No. The organic material has gradually been replaced over millions of years, so that fossils are basically stone.
Paleontologists.
they can be make of bones
They have no bones.
By eating cheese and drinking milk - they contain Calcium, which is the main material that builds the bones; also doing sports to develop strong body.
Fossils form when something dies and it decays over theyears. Thenall you see are the bones. Like dinosaurs bones!
Jellyfish have no real bones, so had no fossils in the sense of the word.
Their fossils (bones).
living and fossils
Harder parts of organisms become fossils. For example vasculature in plants and bones of animals are best preserves in the fossils.