How do most fossils form

As more layers of sediment build up on top, the sediment around the skeleton begins to compact and turn to rock. The bones then start to be dissolved by water seeping through the rock. Minerals in the water replace the bone, leaving a rock replica of the original bone called a fossil.

Fossils form from the plant or animal dying in a watery environment and is buried in mud and silt. Over time sediment builds over top and hardens into rock leaving the out lines of the bones.

Ithink a saturated phospholipid

Ibelieve its b but u might have to