<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:  Provide an explanation of the theory of evolution. Context: The theory of evolution states that species change over time through natural selection and genetic variation. Answer: [/INST]It states that species change over time through natural selection and genetic variation.</s>