You are given a paragraph, with numbered sentences, and a question. Write the numbers of the sentences needed to answer the given question. Separate multiple sentence numbers with a comma (", "). E.g. "1, 2" would be the correct response if Sent 1 and Sent 2 are needed to answer the given question (do not include sentences that contain no information that is necessary to answer the question). Sort the sentence numbers in an increasing order (i.e., '1, 2', instead of '2, 1'). Your answer should not contain anything than the sentence numbers separated by a comma (e.g. '1, 2, 3, 4'). The given question requires more than one sentence to answer. So, your answer must contain at least one comma (", ").

Paragraph- Sent 1: You couldnt survive without your skin.
Sent 2: It has many important functions.
Sent 3: The main function of the skin is controlling what enters and leaves the body.
Sent 4: It prevents the loss of too much water from the body.
Sent 5: It also prevents bacteria and other microorganisms from entering the body.
Sent 6: The skin helps maintain a constant body temperature.
Sent 7: It keeps the body cool in two ways.
Sent 8: Sweat from sweat glands in the skin evaporates to cool the body.
Sent 9: Blood vessels in the skin dilate, or widen.
Sent 10: This action increases blood flow to the body surface.
Sent 11: This allows more heat to reach the surface.
Sent 12: The heat is then able to radiate off the body.
Sent 13: The opposite happens to retain body heat.
Sent 14: Blood vessels in the skin constrict, or narrow.
Sent 15: This decreases blood flow to the body surface.
Sent 16: This reduces the amount of heat that reaches the surface.
Sent 17: When this happens, less heat can be lost to the air.
Question: What happens when heat reaches the surface of your skin?.
11, 12.

Paragraph- Sent 1: (CNN) -- English club Chelsea have completed the signing of Oriol Romeu from Spanish and European champions Barcelona.
Sent 2: The 19-year-old is currently playing for Spain at the World Under-20 Championships in Colombia and has signed a four-year deal with last season's Premier League runners-up.
Sent 3: The deal is worth $7 million and includes a buy back clause, set at $14 million after the first year and $21 million after the second.
Sent 4: Romeu started his career at Barcelona's city rivals Espanyol before joining the Camp Nou academy in 2004.
Sent 5: The midfielder, who can also play in central defence, made his debut for Barcelona in last season's Spanish Supercup match with Seville and got his first taste of league action against Deportivo in May 2010.
Sent 6: He has played 90 minutes in both of Spain's games at the World Under-20 Championships, when they beat Costa Rica and Ecuador.
Sent 7: Chelsea official web site confirmed the signing and said Romeu is "renowned for his strength and his expansive passing ability."Sent 8: Another player leaving Barcelona is Jeffren Suarez after he agreed to join Sporting Lisbon.
Sent 9: The Portuguese outfit have paid $5 million for the 23-year-old which, like the Romeu deal, includes a buy back option.
Sent 10: Jeffren joined Barca from Tenerife in 2004 and made his debut for the Catalan club in the 2006-07 season.
Question: How much is the 19-year-old's deal worth?.
2, 3.

Paragraph- Sent 1: (CNN) -- Gabriel Garcia Marquez, widely regarded as one of the most important contemporary Latin American authors, was admitted to a hospital in Mexico earlier this week, according to the Ministry of Health.
Sent 2: The Nobel Prize recipient, known as "Gabo," had infections in his lungs and his urinary tract.
Sent 3: He was suffering from dehydration, the ministry said.
Sent 4: Garcia Marquez, 87, is responding well to antibiotics, but his release date is still to be determined.
Sent 5: "I wish him a speedy recovery."Sent 6: Mexican President Enrique Pena wrote on Twitter.
Sent 7: Garcia Marquez was born in the northern Colombian town of Aracataca, the inspiration for the fictional town of Macondo, the setting of the 1967 novel "One Hundred Years of Solitude."Sent 8: He won the Nobel Prize for literature in 1982 "for his novels and short stories, in which the fantastic and the realistic are combined in a richly composed world of imagination, reflecting a continent's life and conflicts," according to the Nobel Prize website.
Sent 9: Garcia Marquez has spent many years in Mexico and has a huge following there.
Sent 10: Colombian President Juan Manuel Santos said his country is thinking of the author.
Sent 11: "All of Colombia wishes a speedy recovery to the greatest of all time: Gabriel Garcia Marquez," he tweeted.
Sent 12: CNN en Espanol's Fidel Gutierrez contributed to this story.
Question: Where was Gabriel Garcia Marquez born and when did he win the Nobel Prize?.
7, 8.