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    Side view close up of a multi-ethnic group of teenage male and female choristers holding sheet music and singing standing on the stage of a school theatre during rehearsals for a performance — Stock Photo
    Side view close up of a multi-ethnic group of teenage male and female choristers holding sheet music and singing standing on the stage of a school theatre during rehearsals for a performance
    Portrait close up of a Caucasian teenage boy sitting by a window holding an acoustic guitar and looking to camera in a high school — Stock Photo
    Portrait close up of a Caucasian teenage boy sitting by a window holding an acoustic guitar and looking to camera in a high school
    Secondary tuberculosis lungs infection and close-up of Mycobacterium tuberculosis bacteria. — Stock Photo
    Secondary tuberculosis lungs infection and close-up of Mycobacterium tuberculosis bacteria.
    Front view of a teenage Caucasian girl in a school classroom sitting at desk, concentrating and writing, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage Caucasian girl in a school classroom sitting at desk, concentrating and writing, with teenage male and female classmates sitting at desks working in the background
    Low section of schoolkid studying in the classroom — Stock Photo
    Low section of schoolkid studying in the classroom
    Front view of a group of female Caucasian field hockey players preparing before a game, kneeling in front of their Caucasian male coach, on a hockey pitch, who gives them game plan, on a sunny day — Stock Photo
    Front view of a group of female Caucasian field hockey players preparing before a game, kneeling in front of their Caucasian male coach, on a hockey pitch, who gives them game plan, on a sunny day
    Schoolboy using mobile phone near chalkboard in classroom — Stock Photo
    Schoolboy using mobile phone near chalkboard in classroom
    Junior high school students with hands raised during lesson in classroom — Stock Photo
    Junior high school students with hands raised during lesson in classroom
    University students practicing science experiment in lab — Stock Photo
    University students practicing science experiment in lab
    Portrait smiling, confident girl students researching at computer in library — Stock Photo
    Portrait smiling, confident girl students researching at computer in library
    Focused junior high school boy with headphones in classroom — Stock Photo
    Focused junior high school boy with headphones in classroom
    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question — Stock Photo
    Side view of multi-ethnic group of high school teenagers in a school classroom sitting at desks, all raising their hands to answer a question
    Focused junior high school boys doing homework in classroom — Stock Photo
    Focused junior high school boys doing homework in classroom
    Side view of a mixed race teenage boy and African American teenage girl high school student sitting on chairs in an empty school theatre preparing before a performance, holding scripts and rehearsing together — Stock Photo
    Side view of a mixed race teenage boy and African American teenage girl high school student sitting on chairs in an empty school theatre preparing before a performance, holding scripts and rehearsing together
    High angle rear view of a group of female Caucasian field hockey players preparing before a game, sitting on a stand, holding hockey sticks, with their Caucasian male field hockey coach standing in front of them — Stock Photo
    High angle rear view of a group of female Caucasian field hockey players preparing before a game, sitting on a stand, holding hockey sticks, with their Caucasian male field hockey coach standing in front of them
    Close up of male student practicing experiment in lab — Stock Photo
    Close up of male student practicing experiment in lab
    Teacher and students during chemistry lesson, wearing protective eyewear and looking at test tubes — Stock Photo
    Teacher and students during chemistry lesson, wearing protective eyewear and looking at test tubes
    Front view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, sitting at a table working together, looking at a laptop computer — Stock Photo
    Front view of a multi-ethnic group of high school teenage male and female school pupils in a classroom, sitting at a table working together, looking at a laptop computer
    Front view of a group of female Caucasian field hockey players, training before a game, working out on a field hockey pitch, doing push ups, with their coach in the foreground, on a sunny day — Stock Photo
    Front view of a group of female Caucasian field hockey players, training before a game, working out on a field hockey pitch, doing push ups, with their coach in the foreground, on a sunny day
    Male teacher teaching students in the classroom at school — Stock Photo
    Male teacher teaching students in the classroom at school
    Portrait of confident junior high school student leaving classroom — Stock Photo
    Portrait of confident junior high school student leaving classroom
    Front view of a Caucasian male high school teacher, standing and talking with a teenage Caucasian girl in a school classroom sitting at desk, with teenage classmates sitting at desks working in the background — Stock Photo
    Front view of a Caucasian male high school teacher, standing and talking with a teenage Caucasian girl in a school classroom sitting at desk, with teenage classmates sitting at desks working in the background
    Teenage female practicing chemistry experiment in lab — Stock Photo
    Teenage female practicing chemistry experiment in lab
    Girl student programming and assembling robotics in classroom — Stock Photo
    Girl student programming and assembling robotics in classroom
    Teenagers playing pool indoors — Stock Photo
    Teenagers playing pool indoors
    Surprised students conducting exploding foam scientific experiment in classroom laboratory — Stock Photo
    Surprised students conducting exploding foam scientific experiment in classroom laboratory
    Digital molecular model of secondary structure of immunoglobulin G antibodies. — Stock Photo
    Digital molecular model of secondary structure of immunoglobulin G antibodies.
    Teenagers playing pool indoors — Stock Photo
    Teenagers playing pool indoors
    Girl students studying at computers in library — Stock Photo
    Girl students studying at computers in library
    Junior high school students using futuristic touch screen in classroom — Stock Photo
    Junior high school students using futuristic touch screen in classroom
    Teenage girls designing denim jacket in fashion design class — Stock Photo
    Teenage girls designing denim jacket in fashion design class
    Smiling girl students examining liquid in test tube, conducting scientific experiment in laboratory classroom — Stock Photo
    Smiling girl students examining liquid in test tube, conducting scientific experiment in laboratory classroom
    Side view of a teenage African American male high school student reading to a multi-ethnic class of teenagers sitting at desks in a school classroom listening and concentrating — Stock Photo
    Side view of a teenage African American male high school student reading to a multi-ethnic class of teenagers sitting at desks in a school classroom listening and concentrating
    Portrait confident african american boy playing basketball in schoolyard — Stock Photo
    Portrait confident african american boy playing basketball in schoolyard
    Side view of a male Caucasian teacher standing and talking with a teenage Caucasian girl working on a computer and concentrating in a classroom, with teenage male and female classmates sitting at desks working in the background and foreground — Stock Photo
    Side view of a male Caucasian teacher standing and talking with a teenage Caucasian girl working on a computer and concentrating in a classroom, with teenage male and female classmates sitting at desks working in the background and foreground
    Female teenage students studying at desk in classroom — Stock Photo
    Female teenage students studying at desk in classroom
    Teenagers playing pool indoors — Stock Photo
    Teenagers playing pool indoors
    Low angle view of a group of female Caucasian field hockey players and their Caucasian male coach training before a game, running on a stand up and down, on a sunny day — Stock Photo
    Low angle view of a group of female Caucasian field hockey players and their Caucasian male coach training before a game, running on a stand up and down, on a sunny day
    High school boys spray painting in art class — Stock Photo
    High school boys spray painting in art class
    Portrait of smiling, confident junior high student carrying books — Stock Photo
    Portrait of smiling, confident junior high student carrying books
    Over the shoulder view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room, holding a digital tablet — Stock Photo
    Over the shoulder view of a Caucasian male field hockey coach interacting with a group of female Caucasian field hockey players, sitting in a changing room, holding a digital tablet
    Digital molecular model of secondary structure of immunoglobulin G antibodies. — Stock Photo
    Digital molecular model of secondary structure of immunoglobulin G antibodies.
    Teachers talking at library — Stock Photo
    Teachers talking at library
    Junior high school student using digital tablet in classroom — Stock Photo
    Junior high school student using digital tablet in classroom
    Junior high school students watching teacher give lesson at projection screen in classroom — Stock Photo
    Junior high school students watching teacher give lesson at projection screen in classroom
    Side view of a teenage Caucasian male field hockey player, training on the hockey pitch before a game, preparing to hit the ball with a hockey stick, with his teammates and coach in the background on a sunny day — Stock Photo
    Side view of a teenage Caucasian male field hockey player, training on the hockey pitch before a game, preparing to hit the ball with a hockey stick, with his teammates and coach in the background on a sunny day
    Smiling female student playing acoustic guitar — Stock Photo
    Smiling female student playing acoustic guitar
    Schoolgirl standing near chalkboard in classroom at school — Stock Photo
    Schoolgirl standing near chalkboard in classroom at school
    Junior high students using computer in computer lab — Stock Photo
    Junior high students using computer in computer lab
    Front view of a multi-ethnic group of male and female teenagers with schoolbags hanging out and talking in their school grounds in sunlight — Stock Photo
    Front view of a multi-ethnic group of male and female teenagers with schoolbags hanging out and talking in their school grounds in sunlight
    Side view of a teenage Caucasian boy and a teenage African American girl in a high school classroom sitting at desks, working together and reading, with teenage classmates sitting at desks working in the background — Stock Photo
    Side view of a teenage Caucasian boy and a teenage African American girl in a high school classroom sitting at desks, working together and reading, with teenage classmates sitting at desks working in the background
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, concentrating and reading, with teenage male and female classmates sitting at desks working around him — Stock Photo
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, concentrating and reading, with teenage male and female classmates sitting at desks working around him
    Female college student holding equipment while practicing experiment in laboratory — Stock Photo
    Female college student holding equipment while practicing experiment in laboratory
    Schoolkids standing in school campus on a sunny day — Stock Photo
    Schoolkids standing in school campus on a sunny day
    Students studying in the class at school — Stock Photo
    Students studying in the class at school
    Girl students researching, using computer in library — Stock Photo
    Girl students researching, using computer in library
    Male teacher teaching students in the classroom at school — Stock Photo
    Male teacher teaching students in the classroom at school
    Portrait close up of a Caucasian male field hockey player with red hair, wearing a red team strip, standing on a hockey pitch looking to camera on a sunny day — Stock Photo
    Portrait close up of a Caucasian male field hockey player with red hair, wearing a red team strip, standing on a hockey pitch looking to camera on a sunny day
    Side view close up of a multi-ethnic group of teenage male and female choristers holding sheet music and singing standing on the stage of a school theatre during rehearsals for a performance — Stock Photo
    Side view close up of a multi-ethnic group of teenage male and female choristers holding sheet music and singing standing on the stage of a school theatre during rehearsals for a performance
    Broom stem. Light micrograph (LM) of transverse section through stem of common broom (Salicornia europaea) plant. Broom is drought plant (xerophyte) with ribbed stems and branches to increase area for photosynthesis — Stock Photo
    Broom stem. Light micrograph (LM) of transverse section through stem of common broom (Salicornia europaea) plant. Broom is drought plant (xerophyte) with ribbed stems and branches to increase area for photosynthesis