a geometric pattern formed by a mineral a solid element or compound from Earth's crust remains of an extinct organism found in a rock layer bits of weathered rocks and pieces of dead organisms
Which of these best describes a fossil?

Options:
- a geometric pattern formed by a mineral
- a solid element or compound from Earth's crust
- remains of an extinct organism found in a rock layer
- bits of weathered rocks and pieces of dead organisms

remains of an extinct organism found in a rock layer