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: Create a short summary of the text found below.

Grigori Rasputin, in full Grigori Yefimovich Rasputin, Grigori also spelled Grigory, original name Grigori Yefimovich Novykh, (born January 22 [January 10, Old Style], 1869, Pokrovskoye, near Tyumen, Siberia, Russian Empire—died December 30 [December 17, Old Style], 1916, Petrograd [now St. Petersburg, Russia]), Siberian peasant and mystic whose ability to improve the condition of Aleksey Nikolayevich, the hemophiliac heir to the Russian throne, made him an influential favourite at the court of Emperor Nicholas II and Empress Alexandra.
Response: Grigori Rasputin (1869-1916) was born in what is now St. Petersburg, Russia. He was a Siberian mystic and peasant whose improvement of Aleksey Nikolayevich's hemophilia earned him favor at Emperor Nicholas II's court.

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.

Provide a summary of the main concepts of evolutionary theory from the following text.
user
Evolutionary theory explains how species change over time through natural selection. Organisms with traits better suited to their environment are more likely to survive and reproduce, passing these traits to future generations.
assistant