F ossils form when animals that have died are quickly buried by sand, mud or another sediment.
(F; ossils; form when animals that have died are quickly buried by sand, mud or another sediment) (animals; have died; ) (animals that have died; are quickly buried; by sand, mud or another sediment)
F animals animals that have died
ossils have died are quickly buried
form when animals that have died are quickly buried by sand, mud or another sediment
by sand, mud or another sediment