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: Please briefly sum up what this article says about orcas' bodies. 

Orcas are known for their long dorsal fin (the fin on the animal's back) and black-and-white coloring. The black-and-white coloring helps to camouflage them by obscuring their outline in the water. Just behind the dorsal fin is a patch of gray called a "saddle" — because it looks like a riding saddle. 

An orca's body is cylindrical and tapers at each end to form a hydrodynamic shape. This shape, along with the orca's large size and strength, makes it among the fastest marine mammals, able to reach speeds in excess of 30 knots (about 34 mph, or 56 km/h). Orcas have massive teeth, which can grow up to 4 inches (10 centimeters) long, according to National Geographic.
Response: Orcas have teeth up to 4 inches long, long dorsal fins, black-and-white camouflage coloring, and gray saddles on their cylindrical, hydrodynamic-shaped bodies. They are among the fastest marine mammals, reaching over 30 knots (34 mph or 56 km/h).

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 description of the digestive system provided below.

The digestive system is responsible for processing food, extracting and absorbing nutrients, and eliminating waste. It begins in the mouth, where food is chewed and mixed with saliva to form a bolus that travels down the esophagus to the stomach. In the stomach, gastric juices and enzymes break down the food further into a semi-liquid form called chyme. The chyme then moves into the small intestine, where most absorption of nutrients occurs with the help of bile and pancreatic juices. The remaining waste then passes into the large intestine, where water is absorbed and the waste is formed into stool to be excreted through the rectum and anus.
user
The digestive system processes food starting from the mouth through chewing and saliva. The food travels as a bolus to the stomach, forming chyme which moves to the small intestine for nutrient absorption. Waste is then passed to the large intestine, absorbed of water, and formed into stool for excretion.
assistant