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: Summarize the main points of this news article for me in a couple of sentences.

Oakland Athletics broadcaster Glen Kuiper apologized after uttering what sounded like a racial slur while describing a trip to the Negro Leagues Baseball Museum.

In a pregame segment on NBC Sports California, before the A’s played the Kansas City Royals on Friday night, Kuiper talked about a trip to the museum with colleague Dallas Braden but seemingly mispronounced the word “negro,” making it sound instead like a slur.

Later in the game, Kuiper apologized on the air without getting into specifics.
Response: Glen Kuiper, who is the Oakland Athletics broadcaster, apologized for saying a racial slur.  Kuiper mispronounced "negro" when describing a recent visit to the Negro Leagues Baseball Museum. 

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.

Outline the main points of the theory of evolution by natural selection.
user
The theory of evolution by natural selection, proposed by Charles Darwin, is based on several key points: Variation exists within populations of organisms. Traits that enhance survival and reproduction tend to be passed on more frequently to the next generation. Over time, beneficial traits become more common in the population, leading to gradual evolution. Natural selection acts on heritable traits, and adaptation to the environment results in the diversity of life forms we see today.
assistant