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: Write a one paragraph summary of the provided article. The paragraph shouldn't be more than 7 sentences long and should be easy to understand. 

A parasite might be driving some wolves to lead or go solo.

Wolves in Yellowstone National Park infected with Toxoplasma gondii make more daring decisions than their uninfected counterparts, researchers report November 24 in Communications Biology. The wolves’ enhanced risk-taking means they are more likely to leave their pack, or become leaders of their own.

“Those are two decisions that can really benefit wolves, or could cause wolves to die,” says Connor Meyer, a field biologist at the University of Montana in Missoula. The findings reveal a parasite’s potent ability to influence a wolf’s social fate.

Disease is often considered important for wildlife, mostly in the context of killing its host, Meyer says. “We have evidence now that just being infected with a certain parasite — Toxoplasma — can have pretty major implications for wolf behavior.”
Response: It seems that Yellowstone National Park wolves that are infected with a parasite (Toxoplasma gondii) become risk-takers. This behavior causes the infected wolves to leave the pack, take more risks, and even become pack leaders themselves. This parasite seems to influence a wolf's social fate, and can help create a new leader, and subsequently a new pack, or it could cause the wolf to die. While most diseases in the wild only lead to an animal's death, this particular parasite may help to increase a wolf's standing and social implications. 

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.

Explain the theory of evolution by natural selection in simple terms.
user
The theory of evolution by natural selection, proposed by Charles Darwin, suggests that organisms change over time through variations that increase their chances of survival and reproduction. These favorable traits are passed on to future generations, gradually leading to changes in the species.
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