Fossils are the prehistoric remains or traces of life which have been preserved by natural causes in the Earth's crust.
(Fossils; are; the prehistoric remains or traces of life which have been preserved by natural causes in the Earth's crust) (the prehistoric remains or traces of life; have been preserved; by natural causes in the Earth's crust)
Fossils the prehistoric remains or traces of life
are have been preserved
the prehistoric remains or traces of life which have been preserved by natural causes in the Earth's crust
by natural causes in the Earth's crust