Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.

Input: Consider Input: Paragraph- Sent 1: As food is pushed along, it undergoes digestion.
Sent 2: Digestion is the process of breaking down food into nutrients.
Sent 3: There are two types of digestion: mechanical digestion and chemical digestion.
Sent 4: Mechanical digestion occurs when large chunks are turned into smaller chucks.
Sent 5: Perhaps not surprisingly, this happens when you chew your food.
Sent 6: Once you swallow the food, your stomach also does some of this work.
Sent 7: Chemical digestion occurs when food is broken down into useful nutrients.
Sent 8: This is a chemical process that begins as you start to chew your food.
Sent 9: The saliva in your mouth starts this process.
Sent 10: Once you swallow, the acid in your stomach further breaks down food.
Sent 11: From the stomach, the foods moves into the small intestine.
Sent 12: In the small intestines, another set of chemicals goes to work.
Sent 13: Are you surprised?
Sent 14: Your small intestine, and not your stomach, does most of the work!.
Question: At what point does chemical digestion start?.

Output: Once you swallow the food.

Input: Consider Input: Paragraph- Sent 1: A flood occurs when a river overflows its banks.
Sent 2: This might happen because of heavy rains.
Sent 3: Floodplains In very flat regions, flood water may spread out on the surface of the land.
Sent 4: It then slows down and drops its sediment.
Sent 5: If a river floods often, a floodplain develops.
Sent 6: A floodplain is an area where a thick layer of rich soil is left behind as the floodwater recedes.
Sent 7: Thats why floodplains are usually good places for growing plants.
Sent 8: They are very flat areas and they have very rich soils.
Sent 9: The Nile River valley is a great example of a floodplain.
Sent 10: Each year, the Nile River rises over its banks.
Sent 11: This floodwater carries a lot of sediment.
Sent 12: This sediment has been eroded off areas of land from upstream.
Sent 13: This sediment is dropped as the water slows down after spreading across the land.
Sent 14: What is left behind is a very rich soil.
Sent 15: Thats why crops can be raised in the middle of a sandy desert.
Sent 16: Natural Levees A flooding river often forms natural levees along its banks.
Sent 17: A levee is a raised strip of sediments deposited close to the waters edge.
Question: What is left behind in a flood plain after the water recedes?.

Output: Very rich soil.

Input: Consider Input: Paragraph- Sent 1: Jenny was a 13 year old girl with blond hair and blue eyes.
Sent 2: She had gotten out of her last day of school and was free for the summer.
Sent 3: Two of her friends were going to the nearby beach to do some swimming and enjoy the sun.
Sent 4: Jenny went with them and when they got there the beach was very full and there were people everywhere.
Sent 5: They changed into their bathing suits and went to the water.
Sent 6: The water was very cold.
Sent 7: They chose not swim and walked to the sand.
Sent 8: Then they laid down on some towels and enjoyed the sun.
Sent 9: After several hours Jenny and her friends fell asleep.
Sent 10: They woke up and the sun was beginning to set.
Sent 11: When Jenny sat up she found that it was painful to touch her skin.
Sent 12: When she looked down she saw that she had a very bad sunburn.
Sent 13: Her friends were also very badly sunburned so they went home.
Sent 14: Jenny's mother gave her a cream to put on the sunburn.
Sent 15: Afterwards she felt a lot better and went to sleep.
Question: Who went to the beach?.
Output: Jenny and her two friends.