<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  How do fossils help paleontologists understand the Earth's history? Context: Fossils help paleontologists understand the Earth's history by providing evidence of past life forms and environments. Answer: [/INST]Fossils provide evidence of past life forms and environments, allowing paleontologists to reconstruct the evolutionary history of organisms and the Earth's geological changes over time.</s>