Animals and plants buried under soil for millions of years are called:

The correct answer is Fossils. Fossils are the preserved remains or traces of ancient organisms, such as plants and animals, that have been buried under sediment for millions of years. Over geological time, these remains undergo mineralization, providing invaluable evidence of past life and environments on Earth.

• Species refers to a group of organisms that can interbreed and produce fertile offspring, not the buried remains themselves.
• Minerals are naturally occurring inorganic solids with a definite chemical composition and crystal structure, distinct from organic remains.
• Rocks are naturally occurring solid aggregates of one or more minerals or mineraloids, which can contain fossils but are not the fossils themselves.