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: Brief me on what is going on in this text:

Director Marshall Neilan cast the teenage Anna May in a bit part in his film Dinty (1920), then gave her her first credited role in the "Hop" sequence of Bits of Life (1921), the American movie industry's first anthology film. In "Hop" Wong played Toy Ling, the abused wife of Lon Chaney's character Chin Gow, which the Man of a Thousand Faces played in yellowface. She next appeared in support of John Gilbert in Fox's Shame (1921) before being cast in her first major role at the age of 17, the lead in The Toll of the Sea (1922). She played Lotus Flower in this adaptation of the opera "Madame Butterfly," which moved the action from Japan to China. "The Toll of the Sea" was the first feature film shot entirely in Technicolor's two-strip color process. By appearing top-billed in this romantic melodrama, Anna became the first native-born Asian performer to star in a major Hollywood movie. Most portrayals of Asian women were done by Caucasian actresses in "yellow-face," such as the 1915 Madame Butterfly (1915) starring "America's Sweetheart" Mary Pickford (who was born in Toronto, Canada) in the title role. In "The Toll of the Sea," Anna May's character perpetuates the stereotype of the Asian "lotus blossom," a self-sacrificial woman who surrenders her life for the love of a Caucasian man. The film was a hit, and it showcased Wong in a preternaturally mature and restrained performance. This breakthrough should have launched Anna May Wong as a star, but for one thing: She was Chinese in a country that excluded (by law) Chinese from emigrating to the US, that forbade (by law) Chinese from marrying Caucasians and that generally excluded (by law or otherwise) Chinese from the culture at large, except for bit roles as heavies in the national consciousness.

"The Toll of the Sea" made Anna May Wong a known, and thus a marketable, commodity in Hollywood. She became the #1 actress when a young Asian female part had to be cast, but unfortunately lead roles for Asians were few and far between. Instead of becoming a star, this beautiful woman with a complexion described as "a rose blushing through old ivory" continued to be stuck in supporting roles, as in Tod Browning's melodrama Drifting (1923) and the western Thundering Dawn (1923). She even played an Eskimo in The Alaskan (1924). She appeared as Tiger Lily, "Chieftainess of the Indians," in Paramount's prestigious production of J.M. Barrie's Peter Pan (1924), but the role was very small (the film was shot on Santa Catalina Island, where the cast stayed during the production.
Response: Anna May Wong was cast as a teenager in a few films, including her first credited role. Though she was the first native-born Asian performer to star in a major Hollywood movie and, therefore, somewhat of a commodity in Hollywood, few lead roles called for Asians in her time. So, she was stuck with mostly smaller roles. 

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 key elements of Charles Darwin's theory of evolution by natural selection.
user
Charles Darwin's theory of evolution by natural selection proposes that species evolve over time through a process where individuals with advantageous traits are more likely to survive and reproduce. These traits become more common in subsequent generations, leading to evolutionary change.
assistant