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 what this text says about huskies.

The Siberian husky has erect ears and eyes of brown to blue or maybe even one of each color.

The neck is carried straight and the topline is level. The well-furred tail is carried up in a sickle or sometimes straight out behind.

Siberian huskies have a very dense, plush coat with plenty of undercoat. A small ruff is found around the neck but no long fringes on the legs or tail. Color ranges from black to white and everything in-between. Most dogs do have white markings, particularly on the chest and legs.
Response: Siberian Huskies have straight necks with erect ears and brown and/or blue eyes. Their furry tails curve and their thick coats and undercoats create a ruff around their necks. They're usually black or white with white markings on the legs and chest.

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 characteristics of a polar bear based on this description.

Polar bears are large carnivorous bears that inhabit Arctic regions. They have thick white fur that provides insulation and camouflages them in their snowy environment. Polar bears have a layer of fat beneath their skin that further aids insulation and buoyancy in icy waters. Adult males can weigh between 900 and 1,600 pounds, while females are generally smaller, weighing between 400 and 700 pounds. They primarily feed on seals, which they hunt using their keen sense of smell.
user
Polar bears are large Arctic carnivores with thick white fur and a fat layer for insulation and buoyancy. Males weigh 900 to 1,600 pounds, and females weigh 400 to 700 pounds. They mainly eat seals, using their strong sense of smell to hunt.
assistant