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    Student demonstrating air conditioner recharging manifold with gauges in HVAC classroom — Stock Photo
    Student demonstrating air conditioner recharging manifold with gauges in HVAC classroom
    Female cell biologist examining flask containing stem cells cultivated in red growth medium. — Stock Photo
    Female cell biologist examining flask containing stem cells cultivated in red growth medium.
    Maize root. Light micrograph (LM) of section through root of maize plant (Zea mays) showing typical monocot arrangement of vascular bundles. central vascular cylinder is comprised of central cluster of parenchyma cells — Stock Photo
    Maize root. Light micrograph (LM) of section through root of maize plant (Zea mays) showing typical monocot arrangement of vascular bundles. central vascular cylinder is comprised of central cluster of parenchyma cells
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Female scientist holding tray for stem cell research. — Stock Photo
    Female scientist holding tray for stem cell research.
    Young charming brunette woman in cap looking at camera and holding fresh red flower in room — Stock Photo
    Young charming brunette woman in cap looking at camera and holding fresh red flower in room
    From above of red rose flower with dried leaves and petals placed on table in room — Stock Photo
    From above of red rose flower with dried leaves and petals placed on table in room
    Student who had Spinal Meningitis setting up oscilloscope to use photo detector in laboratory — Stock Photo
    Student who had Spinal Meningitis setting up oscilloscope to use photo detector in laboratory
    Scientist viewing sample on glass slide before light microscope. — Stock Photo
    Scientist viewing sample on glass slide before light microscope.
    Closeup view of chambermaid serving caviar in stemmed glass on tray — Stock Photo
    Closeup view of chambermaid serving caviar in stemmed glass on tray
    Human midbrain, illustration — Stock Photo
    Human midbrain, illustration
    Student in wheelchair studying furnace electronic control system in HVAC classroom — Stock Photo
    Student in wheelchair studying furnace electronic control system in HVAC classroom
    Through glass side view of young female in dress sitting in hothouse with green plants — Stock Photo
    Through glass side view of young female in dress sitting in hothouse with green plants
    Human embryonic stem cell on pin tip, conceptual digital artwork. — Stock Photo
    Human embryonic stem cell on pin tip, conceptual digital artwork.
    Lime tree stem — Stock Photo
    Lime tree stem
    Closeup green tomatoes ripening with raindrops on branches of plant growing in agricultural field in countryside — Stock Photo
    Closeup green tomatoes ripening with raindrops on branches of plant growing in agricultural field in countryside
    Human embryonic stem cell on pin tip, conceptual digital artwork. — Stock Photo
    Human embryonic stem cell on pin tip, conceptual digital artwork.
    Late snowfall on May's star hyacinths — Stock Photo
    Late snowfall on May's star hyacinths
    Back view anonymous shirtless male sitting in dark room near tender thin plant twig with withering leaves — Stock Photo
    Back view anonymous shirtless male sitting in dark room near tender thin plant twig with withering leaves
    Scientist pipetting sample into growth medium in multiwell plate. — Stock Photo
    Scientist pipetting sample into growth medium in multiwell plate.
    Slim woman wearing shorts and top and standing in high field grass and touching stem tenderly — Stock Photo
    Slim woman wearing shorts and top and standing in high field grass and touching stem tenderly
    Goat's cheese and sliced chard stems — Stock Photo
    Goat's cheese and sliced chard stems
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree. — Stock Photo
    Elm stem. Light micrograph (LM) of cross-section through woody stem of elm (Ulmus procera) tree.
    Cropped image of bunch of green garlic on table — Stock Photo
    Cropped image of bunch of green garlic on table
    Purple lily flower on long stem in black glass vase on grey background — Stock Photo
    Purple lily flower on long stem in black glass vase on grey background
    Top view of fresh broccoli sprig representing concept of healthy vegetarian food on white geometric surface — Stock Photo
    Top view of fresh broccoli sprig representing concept of healthy vegetarian food on white geometric surface
    Biotechnology or biotech, concept of creation, division and cellular development. High organic technology with productive purposes — Stock Photo
    Biotechnology or biotech, concept of creation, division and cellular development. High organic technology with productive purposes
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Cochlicopa snail sticking on wild plant stem. — Stock Photo
    Cochlicopa snail sticking on wild plant stem.
    Boy looking into microscope at table at home — Stock Photo
    Boy looking into microscope at table at home
    Girl student examining DNA model in classroom — Stock Photo
    Girl student examining DNA model in classroom
    Vase with fresh green foliage placed on wooden table in terrace in sunlight — Stock Photo
    Vase with fresh green foliage placed on wooden table in terrace in sunlight
    Western sword fern — Stock Photo
    Western sword fern
    Empty white frame hanging on bright dyed green and purple exotic plants in daylight — Stock Photo
    Empty white frame hanging on bright dyed green and purple exotic plants in daylight
    Instructor training students about air conditioning units in HVAC classroom — Stock Photo
    Instructor training students about air conditioning units in HVAC classroom
    Creeping plants shadow on window curtain — Stock Photo
    Creeping plants shadow on window curtain
    Portrait confident, serious male science teacher standing behind molecular structure in classroom — Stock Photo
    Portrait confident, serious male science teacher standing behind molecular structure in classroom
    Woman trimming flower stems. — Stock Photo
    Woman trimming flower stems.
    Section through a grape stem — Stock Photo
    Section through a grape stem
    Crassula ovata succulent plant placed in pot on wooden table in light place — Stock Photo
    Crassula ovata succulent plant placed in pot on wooden table in light place
    Robberfly with its grasshopper prey, Indonesia — Stock Photo
    Robberfly with its grasshopper prey, Indonesia
    Kameyama bamboo forest; Kyoto, Kansai, Japan — Stock Photo
    Kameyama bamboo forest; Kyoto, Kansai, Japan
    Student in wheelchair beside furnace fuel flow controls in HVAC classroom — Stock Photo
    Student in wheelchair beside furnace fuel flow controls in HVAC classroom
    From above of tender bright yellow flower on body of crop anonymous tanned person in sunlight — Stock Photo
    From above of tender bright yellow flower on body of crop anonymous tanned person in sunlight
    Side view of happy female with wavy hair raising hands with hat standing looking up near cane with green foliage — Stock Photo
    Side view of happy female with wavy hair raising hands with hat standing looking up near cane with green foliage
    Scientist viewing sample on glass slide under light microscope. — Stock Photo
    Scientist viewing sample on glass slide under light microscope.
    Ivy stem climbing up tree trunk at autumn forest — Stock Photo
    Ivy stem climbing up tree trunk at autumn forest
    Unrecognizable female with manicure wearing dress demonstrating red laceleaf with pestle and green stem while standing in room on blurred background — Stock Photo
    Unrecognizable female with manicure wearing dress demonstrating red laceleaf with pestle and green stem while standing in room on blurred background
    Close Up Of A Taro Leaf; Maui, Hawaii, United States Of America — Stock Photo
    Close Up Of A Taro Leaf; Maui, Hawaii, United States Of America
    Junior high students using computers and watching teacher at projection screen in classroom — Stock Photo
    Junior high students using computers and watching teacher at projection screen in classroom
    Lime tree stem — Stock Photo
    Lime tree stem
    Field harvesting on the fields — Stock Photo
    Field harvesting on the fields
    Curious girl students conducting scientific experiment in laboratory classroom — Stock Photo
    Curious girl students conducting scientific experiment in laboratory classroom
    Beautiful Nordic drink in small high stem glass sprinkled with red powder and leaf served on grey cloth with scattered dried rose petals on blurred background — Stock Photo
    Beautiful Nordic drink in small high stem glass sprinkled with red powder and leaf served on grey cloth with scattered dried rose petals on blurred background
    Tropical green nature on red background — Stock Photo
    Tropical green nature on red background
    Cute boy with tablet at home — Stock Photo
    Cute boy with tablet at home
    Meadow with dry plants — Stock Photo
    Meadow with dry plants
    Smiling girl students assembling computer in classroom — Stock Photo
    Smiling girl students assembling computer in classroom
    Central nervous system — Stock Photo
    Central nervous system