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    Multi ethnic group of conservation volunteers cleaning up river in the countryside, picking up rubbish. Ecology and social responsibility in rural environment. — Stock Photo
    Multi ethnic group of conservation volunteers cleaning up river in the countryside, picking up rubbish. Ecology and social responsibility in rural environment.
    Side view of a multi-ethnic group of male and female teenager students sitting on a wall talking and using tablet computers in their school grounds — Stock Photo
    Side view of a multi-ethnic group of male and female teenager students sitting on a wall talking and using tablet computers in their school grounds
    Abstract female silhouette with visible brain and spinal cord of nervous system, computer illustration. — Stock Photo
    Abstract female silhouette with visible brain and spinal cord of nervous system, computer illustration.
    University students talking indoors — Stock Photo
    University students talking indoors
    Rural female teacher and happy chinese pupils standing together in school yard — Stock Photo
    Rural female teacher and happy chinese pupils standing together in school yard
    Focused high school girl student taking exam at desk in classroom — Stock Photo
    Focused high school girl student taking exam at desk in classroom
    Teenage girl showing tablet computer to friend while standing in library — Stock Photo
    Teenage girl showing tablet computer to friend while standing in library
    Happy asian girl learning online at home — Stock Photo
    Happy asian girl learning online at home
    Young woman texting with cell phone — Stock Photo
    Young woman texting with cell phone
    Teenagers with video camera and microphone vlogging — Stock Photo
    Teenagers with video camera and microphone vlogging
    Junior high students using computers in computer lab — Stock Photo
    Junior high students using computers in computer lab
    Colored large intestine in female body silhouette, digital illustration. — Stock Photo
    Colored large intestine in female body silhouette, digital illustration.
    Illustration of transparent human heart silhouette. — Stock Photo
    Illustration of transparent human heart silhouette.
    Full body of concentrated barefoot girl reading interesting book while sitting on grassy lawn in backyard against residential building in countryside — Stock Photo
    Full body of concentrated barefoot girl reading interesting book while sitting on grassy lawn in backyard against residential building in countryside
    College students walking and talking in corridor — Stock Photo
    College students walking and talking in corridor
    Man reading book in living room — Stock Photo
    Man reading book in living room
    Side view of a Caucasian female conductor and a multi-ethnic group of teenage male and female choristers standing opposite, singing on the stage of a school theatre during rehearsals for a performance — Stock Photo
    Side view of a Caucasian female conductor and a multi-ethnic group of teenage male and female choristers standing opposite, singing on the stage of a school theatre during rehearsals for a performance
    Full length of cute elementary boy walking amidst hens in pen at organic poultry farm. childhood, homesteading and poultry farming. — Stock Photo
    Full length of cute elementary boy walking amidst hens in pen at organic poultry farm. childhood, homesteading and poultry farming.
    African american students and teachers smiling in class — Stock Photo
    African american students and teachers smiling in class
    From above of focused young female in casual outfit sitting at table with laptop and working online in light workplace at home — Stock Photo
    From above of focused young female in casual outfit sitting at table with laptop and working online in light workplace at home
    Young boy at home looking at a laptop screen, and writing in a notebook. — Stock Photo
    Young boy at home looking at a laptop screen, and writing in a notebook.
    Illustration of colored larynx in transparent human body. — Stock Photo
    Illustration of colored larynx in transparent human body.
    Beautiful woman working on computer in library — Stock Photo
    Beautiful woman working on computer in library
    Boy reading a book. — Stock Photo
    Boy reading a book.
    Boy writing on whiteboard — Stock Photo
    Boy writing on whiteboard
    Young Chinese teacher introducing a new classmate in classroom — Stock Photo
    Young Chinese teacher introducing a new classmate in classroom
    Abstract female body with visible back bones, computer illustration. — Stock Photo
    Abstract female body with visible back bones, computer illustration.
    Young man reading a book in library — Stock Photo
    Young man reading a book in library
    Woman and son lying on bed — Stock Photo
    Woman and son lying on bed
    Female junior high teacher helping girl student at computer in computer lab — Stock Photo
    Female junior high teacher helping girl student at computer in computer lab
    Female paramedic CPR training on baby dummy outdoors. — Stock Photo
    Female paramedic CPR training on baby dummy outdoors.
    Playful girl in classroom — Stock Photo
    Playful girl in classroom
    Male anatomy showing brain and nervous system, computer illustration. — Stock Photo
    Male anatomy showing brain and nervous system, computer illustration.
    Children in classroom during break — Stock Photo
    Children in classroom during break
    Diseased gallbladder in abstract human body, conceptual digital illustration. — Stock Photo
    Diseased gallbladder in abstract human body, conceptual digital illustration.
    Rural female teacher and pupils spending time together in school yard — Stock Photo
    Rural female teacher and pupils spending time together in school yard
    Young Chinese women working in modern office — Stock Photo
    Young Chinese women working in modern office
    Female artists painting picture frames in art class workshop — Stock Photo
    Female artists painting picture frames in art class workshop
    Content female student in glasses and with notepad standing in park and looking at camera — Stock Photo
    Content female student in glasses and with notepad standing in park and looking at camera
    Male anatomy showing Zygomaticus minor muscle, computer illustration. — Stock Photo
    Male anatomy showing Zygomaticus minor muscle, computer illustration.
    Doctors practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctors practicing bag-valve-mask ventilation on training dummy.
    Side view close up of a young African schoolboy sitting at his desk and turning around, looking to camera and smiling during a lesson in a township elementary school classroom. — Stock Photo
    Side view close up of a young African schoolboy sitting at his desk and turning around, looking to camera and smiling during a lesson in a township elementary school classroom.
    Chinese man using laptop in cafe — Stock Photo
    Chinese man using laptop in cafe
    Male teacher watching girl writing — Stock Photo
    Male teacher watching girl writing
    Multi colored chalks and red heart — Stock Photo
    Multi colored chalks and red heart
    Young boy video conferencing with class on computer — Stock Photo
    Young boy video conferencing with class on computer
    From above opened notebook with blank black and pink pages in composition with red and blue pens on white duvet on bed in light bedroom of modern apartment — Stock Photo
    From above opened notebook with blank black and pink pages in composition with red and blue pens on white duvet on bed in light bedroom of modern apartment
    Female student writing on adhesive note while studying at desk in classroom — Stock Photo
    Female student writing on adhesive note while studying at desk in classroom
    Close up portrait of confused students looking in camera — Stock Photo
    Close up portrait of confused students looking in camera
    Smiling college graduates in cap and gown — Stock Photo
    Smiling college graduates in cap and gown
    Front view of a Caucasian teenage girl and boy embracing and smiling, the girl squeezing the face of the boy while she takes a selfie of them with a smartphone in their school grounds, another teenage couple sitting in the background — Stock Photo
    Front view of a Caucasian teenage girl and boy embracing and smiling, the girl squeezing the face of the boy while she takes a selfie of them with a smartphone in their school grounds, another teenage couple sitting in the background
    African american boy showing how to recycle plastic items to other students in class at school. school and education concept — Stock Photo
    African american boy showing how to recycle plastic items to other students in class at school. school and education concept
    Focused high school girl student studying in classroom — Stock Photo
    Focused high school girl student studying in classroom
    Young scientist concentrating on an experiment wearing lab coat — Stock Photo
    Young scientist concentrating on an experiment wearing lab coat
    Four children standing by the blackboard. — Stock Photo
    Four children standing by the blackboard.
    Empty work tables in classroom, Bradenton, Florida, USA — Stock Photo
    Empty work tables in classroom, Bradenton, Florida, USA
    Woman sitting and reading book in library — Stock Photo
    Woman sitting and reading book in library
    Caucasian male doctor talking to group of diverse students sitting in the class at school. health protection and safety at school during covid-19 pandemic concept — Stock Photo
    Caucasian male doctor talking to group of diverse students sitting in the class at school. health protection and safety at school during covid-19 pandemic concept
    Illustration of colored larynx in transparent human body. — Stock Photo
    Illustration of colored larynx in transparent human body.
    Illustration of lungs with close-up with infection in male body silhouette on black background. — Stock Photo
    Illustration of lungs with close-up with infection in male body silhouette on black background.