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    Secondary follicles in an ovary — Stock Photo
    Secondary follicles in an ovary
    Female students studying at desk in classroom — Stock Photo
    Female students studying at desk in classroom
    Cropped image of teenage girl using smartphone at desk in classroom — Stock Photo
    Cropped image of teenage girl using smartphone at desk in classroom
    High school students clapping for classmate in debate class — Stock Photo
    High school students clapping for classmate in debate class
    Front view mid section of teenage boy musician standing playing a saxophone front of a window during a school band practice — Stock Photo
    Front view mid section of teenage boy musician standing playing a saxophone front of a window during a school band practice
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, raising his hand to answer a question, with teenage male and female classmates sitting at desks working in the background — Stock Photo
    Front view of a teenage mixed-race boy in a school classroom sitting at desk, raising his hand to answer a question, with teenage male and female classmates sitting at desks working in the background
    Ovarian cells section — Stock Photo
    Ovarian cells section
    Close up of young female college student looking at chemical while practicing experiment in lab — Stock Photo
    Close up of young female college student looking at chemical while practicing experiment in lab
    Front view of a multi-ethnic group of teenage male field hockey players preparing before a game, in a huddle on the pitch, interacting on a sunny day — Stock Photo
    Front view of a multi-ethnic group of teenage male field hockey players preparing before a game, in a huddle on the pitch, interacting on a sunny day
    Teenage girl using laptop computer while sitting in classroom — Stock Photo
    Teenage girl using laptop computer while sitting in classroom
    Side view of a group of female Caucasian field hockey players preparing before a game, sitting in a changing room, putting on their shoes and gaiters — Stock Photo
    Side view of a group of female Caucasian field hockey players preparing before a game, sitting in a changing room, putting on their shoes and gaiters
    Students studying in the classroom at school — Stock Photo
    Students studying in the classroom at school
    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    Girl student using microscope in classroom — Stock Photo
    Girl student using microscope in classroom
    Side view close up of two Caucasian teenage girls with long dark hair sitting in front of a window playing a flute and a ukulele — Stock Photo
    Side view close up of two Caucasian teenage girls with long dark hair sitting in front of a window playing a flute and a ukulele
    Female high school teacher helping girl student studying at table in classroom — Stock Photo
    Female high school teacher helping girl student studying at table in classroom
    France, Limousin, triticale field, hybrid of wheat and rye, near Aubusson. — Stock Photo
    France, Limousin, triticale field, hybrid of wheat and rye, near Aubusson.
    Curious, smiling girl students listening in classroom — Stock Photo
    Curious, smiling girl students listening in classroom
    France, Southern France, Vileveyrac, Cistercian abbey of Holy Mary of Valmagne, 13th century, gothic style, nave turned into a wine storehouse after the Revolution — Stock Photo
    France, Southern France, Vileveyrac, Cistercian abbey of Holy Mary of Valmagne, 13th century, gothic style, nave turned into a wine storehouse after the Revolution
    Side view of a African American teenage girl in an empty high school theatre, sitting in the auditorium preparing for a performance, holding a script and learning lines — Stock Photo
    Side view of a African American teenage girl in an empty high school theatre, sitting in the auditorium preparing for a performance, holding a script and learning lines
    Schoolkids using globe in classroom at school — Stock Photo
    Schoolkids using globe in classroom at school
    Junior high students in library — Stock Photo
    Junior high students in library
    Side view of a Caucasian teenage girl playing a violin at a school band practice, with a saxophonist playing in the background — Stock Photo
    Side view of a Caucasian teenage girl playing a violin at a school band practice, with a saxophonist playing in the background
    High school students clapping for teacher in debate class — Stock Photo
    High school students clapping for teacher in debate class
    Side view of a Caucasian female field hockey player, during a field hockey game, running with a ball, holding a hockey stick, with her teammates and opponents in the background, on a sunny day — Stock Photo
    Side view of a Caucasian female field hockey player, during a field hockey game, running with a ball, holding a hockey stick, with her teammates and opponents in the background, on a sunny day
    Front view of a multi-ethnic group of teenage male field hockey players, training before a game, working out on a field hockey pitch, running on a sunny day — Stock Photo
    Front view of a multi-ethnic group of teenage male field hockey players, training before a game, working out on a field hockey pitch, running on a sunny day
    France, Dordogne, plowed fields and forest. Pool of light — Stock Photo
    France, Dordogne, plowed fields and forest. Pool of light
    Junior high students using computer in computer lab — Stock Photo
    Junior high students using computer in computer lab
    Junior high school boy student doing homework in classroom — Stock Photo
    Junior high school boy student doing homework in classroom
    Side view of female teenage student reading book while sitting by shelf in library — Stock Photo
    Side view of female teenage student reading book while sitting by shelf in library
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow). — Stock Photo
    Coloured X-ray of the chest of a 52 year old female patient with metastatic (secondary) lung cancer (yellow).
    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
    Male teacher and smiling girl student conducting scientific experiment at microscope in laboratory classroom — Stock Photo
    Male teacher and smiling girl student conducting scientific experiment at microscope in laboratory classroom
    Portrait of confident junior high school student doing homework in classroom — Stock Photo
    Portrait of confident junior high school student doing homework in classroom
    Teenage girl operating video camera, vlogging — Stock Photo
    Teenage girl operating video camera, vlogging
    LAOS, 4000 ISLANDS AREA: Group of children in uniform walking together from school. — Stock Photo
    LAOS, 4000 ISLANDS AREA: Group of children in uniform walking together from school.
    Low angle front view of a Caucasian teenage female high school student in an empty high school theatre preparing before a performance, standing on the stage, holding a script and practicing her part — Stock Photo
    Low angle front view of a Caucasian teenage female high school student in an empty high school theatre preparing before a performance, standing on the stage, holding a script and practicing her part
    Sri Lanka. Mirissa, planting cinnamon. Cinnamon is the inner bark of the cinnamon tree. Artisanal preparation of cinnamon stick. — Stock Photo
    Sri Lanka. Mirissa, planting cinnamon. Cinnamon is the inner bark of the cinnamon tree. Artisanal preparation of cinnamon stick.
    Female geography teacher with globe teaching lesson in classroom — Stock Photo
    Female geography teacher with globe teaching lesson in classroom
    Portrait smiling, confident girl student researching at computer in library — Stock Photo
    Portrait smiling, confident girl student researching at computer in library
    Portrait confident female teacher at projection screen in classroom — Stock Photo
    Portrait confident female teacher at projection screen in classroom
    Side view mid section of group of teenage male and female choristers standing in a row holding sheet music on the stage of a school theatre during rehearsals for a performance — Stock Photo
    Side view mid section of group of teenage male and female choristers standing in a row holding sheet music on the stage of a school theatre during rehearsals for a performance
    Digital illustration of solid node in right lung near lung apex while secondary tuberculosis infection. — Stock Photo
    Digital illustration of solid node in right lung near lung apex while secondary tuberculosis infection.
    Male teacher teaching students in the classroom at school — Stock Photo
    Male teacher teaching students in the classroom at school
    Side view of a Caucasian sad teenage girl sitting on the ground alone in a schoolyard in a high school — Stock Photo
    Side view of a Caucasian sad teenage girl sitting on the ground alone in a schoolyard in a high school
    Curious junior high school student looking at map on computer in classroom — Stock Photo
    Curious junior high school student looking at map on computer in classroom
    Smiling, eager girl student asking a question in classroom — Stock Photo
    Smiling, eager girl student asking a question in classroom
    Teenagers and teacher talking in community center — Stock Photo
    Teenagers and teacher talking in community center
    Girl students conducting scientific experiment in chemistry laboratory classroom — Stock Photo
    Girl students conducting scientific experiment in chemistry laboratory classroom
    Portrait of a Caucasian male field hockey coach, preparing his team for a game, standing on a hockey pitch, looking at camera, with his team standing in the background on a sunny day — Stock Photo
    Portrait of a Caucasian male field hockey coach, preparing his team for a game, standing on a hockey pitch, looking at camera, with his team standing in the background on a sunny day
    Male teacher teaching students in the class at school — Stock Photo
    Male teacher teaching students in the class at school
    High angle view of a multi-ethnic group of teenage school pupils sitting and standing around a table in a classroom using laptop and tablet computers together at break time looking up to camera and smiling — Stock Photo
    High angle view of a multi-ethnic group of teenage school pupils sitting and standing around a table in a classroom using laptop and tablet computers together at break time looking up to camera and smiling
    Female teacher and girl student programming robotics at laptop in classroom — Stock Photo
    Female teacher and girl student programming robotics at laptop in classroom
    Digital illustration of solid node in right lung near lung apex while secondary tuberculosis infection. — Stock Photo
    Digital illustration of solid node in right lung near lung apex while secondary tuberculosis infection.
    Rear view of a group of female Caucasian field hockey players, preparing before a game, standing in a row embracing with hands on their teammates shoulders, on a sunny day — Stock Photo
    Rear view of a group of female Caucasian field hockey players, preparing before a game, standing in a row embracing with hands on their teammates shoulders, on a sunny day
    Portrait confident girl student researching at computer in library — Stock Photo
    Portrait confident girl student researching at computer in library
    Side view of a Caucasian teenage girl sitting on the edge of the stage holding a script in an empty school theatre during rehearsals for a performance — Stock Photo
    Side view of a Caucasian teenage girl sitting on the edge of the stage holding a script in an empty school theatre during rehearsals for a performance
    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 teenage school pupils and their Caucasian male teacher standing in a classroom looking at laptop computers together, the pupils listening while the teacher talks — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils and their Caucasian male teacher standing in a classroom looking at laptop computers together, the pupils listening while the teacher talks
    Focused boy student using microscope in classroom — Stock Photo
    Focused boy student using microscope in classroom