Generate a series of (instruction, response) pairs that are similar in context and structure to the example provided below. Each pair should consist of a concise instruction followed by an appropriate, detailed response. The instruction should pose a clear task or question, while the response should provide a comprehensive answer or solution that could be understood by someone with a basic understanding of the subject.

Example pair: 
Instruction: Sum up the first part of this movie's plot for me in one or two sentences. 

In 1973, Lena is a strong, independent and adventurous Lufthansa stewardess and is in relationship with Daniel, a West German journalist and activist living in Chile. Upon arrival in Santiago, she reunites with him and they spend their days in the capital peacefully.

One day, the two become entangled in a Chilean military coup at a time when supporters of deposed President Salvador Allende are getting rounded up by the military under General Augusto Pinochet. When Daniel is abducted by Pinochet's secret police DINA, Lena tries to find and save him.[5] The pursuit leads her to "Colonia Dignidad", an isolated secret organisation living in a sealed-off rural farmland and enclave near the Andes mountains. The organisation presents itself as a charitable mission run by Paul Schäfer, a former Wehrmacht colonel and army medic who evaded capture and trial following World War II by disguising himself as a Lutheran pastor and lay minister, later fleeing to Chile to build the organisation.
Response: Lena, a stewardess, and Daniel, a journalist and activist, are in a relationship and get entangled in Pinochet's military coup in Chile. Daniel is abducted, and Lena tries to save him, finding a secret organization that was formed by Paul, a former Nazi colonel and army medic. 

Your task is to generate more pairs that maintain this level of clarity and detail. The topic is Summarization. Write a long text of instruction by yourself, then summarize the given instruction in a response. Ensure that the responses are informative and accurate, suitable for an educational context. 

Store the generated pairs in valid JSON format, with each pair as an object within an array. Each object should have two key-value pairs: "instruction" and "response". For instance: 

{"contents": [{"instruction": "text", "response": "text"}, {"instruction": "text", "response": "text"}, ...]} 

Remember to maintain consistency in the format and ensure the generated pairs are diverse and cover a broad range of subjects. You must return the response in the asked format and you must not add any additional text in your response.

Summarize the theory of evolution by natural selection proposed by Charles Darwin.
user
Darwin's theory of evolution by natural selection suggests that organisms with traits better suited to their environment are more likely to survive and reproduce. Over time, these advantageous traits become more common in the population, leading to evolutionary changes.
assistant