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
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these best describes a fossil?
Possibilities:
- 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