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    Children raising hands — Stock Photo
    Children raising hands
    Diseased lungs in transparent male body on white background, computer illustration. — Stock Photo
    Diseased lungs in transparent male body on white background, computer illustration.
    Male anatomy with orange colored small intestine, digital illustration. — Stock Photo
    Male anatomy with orange colored small intestine, digital illustration.
    Junior high girl students walking in corridor — Stock Photo
    Junior high girl students walking in corridor
    Male student looking away while sitting with female classmates in classroom — Stock Photo
    Male student looking away while sitting with female classmates in classroom
    Abstract male silhouette with colored sinuses bones, computer illustration. — Stock Photo
    Abstract male silhouette with colored sinuses bones, computer illustration.
    Side view of a young Asian female student wearing a turban and headphones, using a laptop computer and studying in a library — Stock Photo
    Side view of a young Asian female student wearing a turban and headphones, using a laptop computer and studying in a library
    Young girl playing archery — Stock Photo
    Young girl playing archery
    Female artist sketching at easel in art class studio — Stock Photo
    Female artist sketching at easel in art class studio
    Portrait happy active senior man meeting with group in circle in community center — Stock Photo
    Portrait happy active senior man meeting with group in circle in community center
    Illustration of spinal fusion in human skeleton. — Stock Photo
    Illustration of spinal fusion in human skeleton.
    Male speaker talking on stage — Stock Photo
    Male speaker talking on stage
    Male skeleton in transparent body silhouette, computer illustration. — Stock Photo
    Male skeleton in transparent body silhouette, computer illustration.
    College student using laptop in classroom — Stock Photo
    College student using laptop in classroom
    Lungs in anatomy of male body, computer illustration. — Stock Photo
    Lungs in anatomy of male body, computer illustration.
    Male electrician using screwdriver, working at electric panel — Stock Photo
    Male electrician using screwdriver, working at electric panel
    Illustration of senior woman silhouette with colored kidneys on white background. — Stock Photo
    Illustration of senior woman silhouette with colored kidneys on white background.
    Grandmother and Child Taking a Selfie at home — Stock Photo
    Grandmother and Child Taking a Selfie at home
    Young man reading a book in library — Stock Photo
    Young man reading a book in library
    Audience clapping for speaker indoors — Stock Photo
    Audience clapping for speaker indoors
    Student drawing on chalkboard in classroom — Stock Photo
    Student drawing on chalkboard in classroom
    Woman texting with cell phone in audience at technology conference — Stock Photo
    Woman texting with cell phone in audience at technology conference
    Artificial intelligence, conceptual illustration. — Stock Photo
    Artificial intelligence, conceptual illustration.
    Close up of microscope in laboratory — Stock Photo
    Close up of microscope in laboratory
    Illustration of inflamed heart in human body silhouette. — Stock Photo
    Illustration of inflamed heart in human body silhouette.
    Teenage friends studying — Stock Photo
    Teenage friends studying
    Illustration of stomach in human body silhouette. — Stock Photo
    Illustration of stomach in human body silhouette.
    Side view close up of a young Asian female student wearing a hijab making notes and studying in a library — Stock Photo
    Side view close up of a young Asian female student wearing a hijab making notes and studying in a library
    Close-up illustration of thyroid gland in male body silhouette. — Stock Photo
    Close-up illustration of thyroid gland in male body silhouette.
    Hand of university student doing a chemical experiment in laboratory — Stock Photo
    Hand of university student doing a chemical experiment in laboratory
    Woman sitting and reading book in library — Stock Photo
    Woman sitting and reading book in library
    Woman giving presentation on projection screen — Stock Photo
    Woman giving presentation on projection screen
    Side view 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 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
    Audience clapping for female speaker — Stock Photo
    Audience clapping for female speaker
    Community college instructor helping students with paperwork in classroom — Stock Photo
    Community college instructor helping students with paperwork in classroom
    Woman teaching her daughter at home — Stock Photo
    Woman teaching her daughter at home
    Side view of schoolgirl playing piano in music school — Stock Photo
    Side view of schoolgirl playing piano in music school
    3d illustration of cancer cells attacked and killed by lymphocytes. — Stock Photo
    3d illustration of cancer cells attacked and killed by lymphocytes.
    Little jockey carrying equipment on arena after training in equestrian school — Stock Photo
    Little jockey carrying equipment on arena after training in equestrian school
    3d rendered illustration of human brain on white background. — Stock Photo
    3d rendered illustration of human brain on white background.
    High school girls ascending stairs — Stock Photo
    High school girls ascending stairs
    Smiling boy playing on slide — Stock Photo
    Smiling boy playing on slide
    From above of models of dental jaw and crowns placed on table with burnisher and pencils in modern laboratory — Stock Photo
    From above of models of dental jaw and crowns placed on table with burnisher and pencils in modern laboratory
    Graduate holding cap while friends sitting — Stock Photo
    Graduate holding cap while friends sitting
    Little kid standing at blackboard in classroom — Stock Photo
    Little kid standing at blackboard in classroom
    Transparent male silhouette with visible large intestine, computer illustration. — Stock Photo
    Transparent male silhouette with visible large intestine, computer illustration.
    Purple colored probiotic rod-shaped gram-positive aerobic Bacillus clausii bacteria restoring microflora of intestine. — Stock Photo
    Purple colored probiotic rod-shaped gram-positive aerobic Bacillus clausii bacteria restoring microflora of intestine.
    Male anatomy showing Biceps femoris longus muscle, computer illustration. — Stock Photo
    Male anatomy showing Biceps femoris longus muscle, computer illustration.
    Teacher and student learning over computer classes during isolat — Stock Photo
    Teacher and student learning over computer classes during isolat
    Preschooler coloring shapes with colorful pens for developmental psychology test in psychologist office. — Stock Photo
    Preschooler coloring shapes with colorful pens for developmental psychology test in psychologist office.
    Front view of a Caucasian teenage girl and boy sitting on the edge of the stage holding scripts and smiling at each other in an empty school theatre during rehearsals for a performance — Stock Photo
    Front view of a Caucasian teenage girl and boy sitting on the edge of the stage holding scripts and smiling at each other in an empty school theatre during rehearsals for a performance
    Shoulder bones in x-ray digital illustration of human body. — Stock Photo
    Shoulder bones in x-ray digital illustration of human body.
    Girl lifts her hair from her forehead to have her temperature measured — Stock Photo
    Girl lifts her hair from her forehead to have her temperature measured
    Male anatomy showing Semispinalis capitis muscle, computer illustration. — Stock Photo
    Male anatomy showing Semispinalis capitis muscle, computer illustration.
    Front view of a multi-ethnic group of teenage school pupils standing together in a classroom looking at a tablet computer and smiling at break time — Stock Photo
    Front view of a multi-ethnic group of teenage school pupils standing together in a classroom looking at a tablet computer and smiling at break time
    Two happy young asian children eating in cafe — Stock Photo
    Two happy young asian children eating in cafe
    Female friends talking in locker room — Stock Photo
    Female friends talking in locker room
    Smiling female friends with laptop — Stock Photo
    Smiling female friends with laptop
    Chinese school students raising hands in rural primary school — Stock Photo
    Chinese school students raising hands in rural primary school
    Male artists painting at easel in art class studio — Stock Photo
    Male artists painting at easel in art class studio