A gill is a respiratory organ found in many aquatic organisms that extracts dissolved oxygen from water, afterward excreting carbon dioxide. The gills of some species such as hermit crabs have adapted to allow respiration on land provided they are kept moist. The microscopic structure of a gill presents a large surface area to the external environment.

Many microscopic aquatic animals, and some that are larger but inactive, can absorb adequate oxygen through the entire surface of their bodies, and so can respire adequately without a gill. However, more complex or more active aquatic organisms usually require a gill or gills.^{[citation needed]}

Gills usually consist of thin filaments of tissue, branches, or slender tufted processes that have a highly folded surface to increase surface area. A high surface area is crucial to the gas exchange of aquatic organisms as water contains only a small fraction of the dissolved oxygen that air does. A cubic meter of air contains about 250 grams of oxygen at STP. For a typical freshwater oxygen concentration of 5 parts per millon by mass, a cubic meter of water will contain 5 grams of oxygen. This is about 1/50th of the oxygen of the same volume of air.

Amrinder Gill (Punjabi: ਅਮਰਿੰਦਰ ਗਿੱਲ) is a Punjabi singer and an actor.

He was born and raised in Boorchand village, Amritsar, Punjab. He has a master's degree in agriculture science. He was passionate about singing since his childhood, and came into the public limelight with his breakthrough track “Paigam,” followed by such hits such like “Daru,” “Madhaania,” “Khedan De Din,” with Sunidhi Chauhan, and many others like “Mail Kara De” and “Dildarian.”

He made his acting debut in director Manmohan Singh's superhit Punjabi Film Munde U.K. De in 2009 in a supporting role with Jimmy Shergill and Neeru Bajwa. He followed that up with a lead role in Manmohan Singh's Ik Kudi Punjab Di. His next film Taur Mittran Di for Jimmy Shergill productions releases in May 2012 which pairs him with actress Surveen Chawla and costars MTV VJ and Bollywood actor Rannvijay Singh. His next movie underproduction is Tu Mera 22 Man Tera 22 which pairs him with Punjabi rapper Honey Singh and actress Mandy Takhar

Amrinder Gill has been featured on a few Punjabi Film Soundtracks:

Vincent Grant "Vince" Gill (born April 12, 1957) is an American country singer-songwriter and multi-instrumentalist. He has achieved commercial success and fame both as frontman to the country rock band Pure Prairie League in the 1970s, and as a solo artist beginning in 1983, where his talents as a vocalist and musician have placed him in high demand as a guest vocalist, and a duet partner. Gill has recorded more than twenty studio albums, charted over forty singles on the U.S. Billboard charts as Hot Country Songs, and has sold more than 22 million albums. He has been honored by the Country Music Association with 18 CMA Awards, including two Entertainer of the Year awards and five Male Vocalist Awards. Gill has also earned 27 Grammy Awards, more than any other male Country music artist. In 2007, Gill was inducted into the Country Music Hall of Fame.

Vincent Grant "Vince" Gill was born in Norman, Oklahoma. His father, J. Stanley Gill, was a lawyer and administrative law judge who played in a country music band part time and encouraged Gill to pursue a music career. At the encouragement of his father, Gill learned to play several instruments, including the banjo and guitar, before he started high school at Oklahoma City's Northwest Classen High School. He first played with a teenage band called Bluegrass Revues in the late 1970s. The other members were: Billy Perry on the banjo, Bobby Clark on the triangle and Mike Perry on the bass.

Kulwinder Singh Gill known as Guggu Gill (Punjabi:ਗੁੱਗੂ ਗਿੱਲ) is a Punjabi film actor. He was a leading actor in Punjabi cinema (Punjwood) in the 1990s along with Yograj Singh. He has done 30-40 films so far.

He debuted with a minor role in super-hit Putt Jattan De in a Dog fight scene. He has starred in films including Jatt Jeona Morh, Truck Driver, Badla Jatti Da and Jatt Te Zameen. He is known for the villainous role he played in Gabhroo Punjab Da. His career as leading hero has paired him with top female artists from Punjabi cinema like Daljeet Kaur, Upasana Singh, Priti Sapru, Manjeet Kullar and Ravinder Mann. He has done 7-8 films with Director Ravinder Ravi, which includes hits like Anakh Jattan Di, [[Jatt Jeona Morh (1991)|Jatt Jeona Morh] and Pratigya.

He is a resident of Mahni Khera village near Malout city in Muktsar district, Punjab (India). He has two sons, Guramrit Singh and Gurjot Singh. He belongs to the famous Gill family, which made the Putt Jattan De movie.

Gugu Gill at the Internet Movie Database

Gavie Chahal (born November 11, 1978) is an Indian actor from Mansa, Punjab. He also had worked in Punjab Police.He participated in many fashion shows and won the title of Mr Punjab in the year 2000 after which he started a career in the music industry. His first music video was Jattan De Putt Saadh Ho Gaye. Since then, he has appeared in more than 60 music videos.^{[citation needed]} Subsequently, in 2005, he moved to Mumbai to start acting in the soap opera Kyunki Saas Bhi Kabhi Bahu Thi. He left the show to act in the Punjabi film Yaaran Naal Baharan. He has also featured in a variety of advertising campaigns. Chahal also participated in AXN's adventure show Fear Factor, winning the competition.^{[citation needed]}He currently plays the role of 'Shivendu Kaushik' in Mrs. Kaushik Ki Paanch Bahuein that airs on Zee TV.