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: Hello. Please review this information and provide a summary of why earthquakes happen and what happens during an earthquake.

An earthquake is what happens when two blocks of the earth, or tectonic plates, suddenly slip past one another. The surface where they slip is called the fault or fault plane. The location below the earth’s surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter.

Sometimes an earthquake has foreshocks. These are smaller earthquakes that happen in the same place as the larger earthquake that follows. Scientists can’t tell that an earthquake is a foreshock until the larger earthquake happens. The largest, main earthquake is called the mainshock. Mainshocks always have aftershocks that follow. These are smaller earthquakes that occur afterwards in the same place as the mainshock. Depending on the size of the mainshock, aftershocks can continue for weeks, months, and even years after the mainshock!
Response: An earthquake is the result of two tectonic plates colliding as they move past each other. Earthquakes may give a foreshock as a warning that a larger quake is coming, but this does not always happen. Next comes the mainshock, which is the largest shock of the earthquake. That is then followed by aftershocks. 

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.

Can you explain what the theory of evolution by natural selection entails?
user
The theory of evolution by natural selection, proposed by Charles Darwin, explains how species evolve over time through gradual changes in their genetic characteristics. It posits that individuals within a species exhibit variations in traits, and some of these traits provide advantages for survival and reproduction. Individuals with advantageous traits are more likely to survive and reproduce, passing these traits to the next generation. Over long periods, this process results in the evolution of species, adapting them to their environment.
assistant