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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
    Close-up of hand of cell biologist holding flask of stem cells cultivated in red growth medium. — Stock Photo
    Close-up of hand of cell biologist holding flask of stem cells cultivated in red growth medium.
    Cross-section through a cotton stem — Stock Photo
    Cross-section through a cotton stem
    Digital illustration of human cells on blue background. — Stock Photo
    Digital illustration of human cells on blue background.
    Pieces of fresh green Aloe Vera with white flesh on light background. — Stock Photo
    Pieces of fresh green Aloe Vera with white flesh on light background.
    High angle of lichen on tree branch among green branches in abundant forest — Stock Photo
    High angle of lichen on tree branch among green branches in abundant forest
    Green leaves, flora and foliage on nature background — Stock Photo
    Green leaves, flora and foliage on nature background
    Student examining control system wiring on furnace in HVAC classroom with one student in wheelchair — Stock Photo
    Student examining control system wiring on furnace in HVAC classroom with one student in wheelchair
    Boy student holding and examining molecular structure — Stock Photo
    Boy student holding and examining molecular structure
    From above of small green echeveria plant placed on wooden table with roots and dirt in light place — Stock Photo
    From above of small green echeveria plant placed on wooden table with roots and dirt in light place
    Closeup view of Glass vases with eucalyptus — Stock Photo
    Closeup view of Glass vases with eucalyptus
    Acoustic guitar and ukulele placed on green grass growing in nature in summer time in daylight — Stock Photo
    Acoustic guitar and ukulele placed on green grass growing in nature in summer time in daylight
    Papilio butterfly with spread wings sitting on plant stem against blurred background — Stock Photo
    Papilio butterfly with spread wings sitting on plant stem against blurred background
    Back view thoughtful bearded male with naked torso holding small twig of oak tree branch against white wall — Stock Photo
    Back view thoughtful bearded male with naked torso holding small twig of oak tree branch against white wall
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Light micrograph of a cross sections of monocot stem. — Stock Photo
    Light micrograph of a cross sections of monocot stem.
    Focused boy student assembling electronics in classroom — Stock Photo
    Focused boy student assembling electronics in classroom
    From above of crop happy ethnic young female florist in apron smiling and cutting wrapping paper while arranging elegant bouquet of fresh assorted colorful flowers — Stock Photo
    From above of crop happy ethnic young female florist in apron smiling and cutting wrapping paper while arranging elegant bouquet of fresh assorted colorful flowers
    From above of prickly cacti with spiky stems growing in pots in botanical garden — Stock Photo
    From above of prickly cacti with spiky stems growing in pots in botanical garden
    Dreamy positive redhead female in dress standing near glass doorway of glasshouse with lush plants — Stock Photo
    Dreamy positive redhead female in dress standing near glass doorway of glasshouse with lush plants
    Student setting up generator experiment while instructor discusses HVAC system to student in wheelchair — Stock Photo
    Student setting up generator experiment while instructor discusses HVAC system to student in wheelchair
    Close-up of hands of female scientist working in laboratory with pipette and flask. — Stock Photo
    Close-up of hands of female scientist working in laboratory with pipette and flask.
    Green fern frond against empty road and gloomy woodland — Stock Photo
    Green fern frond against empty road and gloomy woodland
    Top view of raw cut Boletus edulis mushrooms on rustic wooden chopping board during cooking process — Stock Photo
    Top view of raw cut Boletus edulis mushrooms on rustic wooden chopping board during cooking process
    Tropical jungle Monstera leaf — Stock Photo
    Tropical jungle Monstera leaf
    Lavandula, X-ray, radiology scan — Stock Photo
    Lavandula, X-ray, radiology scan
    Exotic hummingbird sitting on twig on blurred background — Stock Photo
    Exotic hummingbird sitting on twig on blurred background
    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
    Beautiful freshly cut long twigs with green leaves and purple flowers standing in glass jar with water on round wooden table in old shabby room with mirrors — Stock Photo
    Beautiful freshly cut long twigs with green leaves and purple flowers standing in glass jar with water on round wooden table in old shabby room with mirrors
    Girl students using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl students using microscope, conducting scientific experiment in laboratory classroom
    Fresh chard (seen from above) — Stock Photo
    Fresh chard (seen from above)
    Portrait smiling, confident girl student solving physics equations at whiteboard in classroom — Stock Photo
    Portrait smiling, confident girl student solving physics equations at whiteboard in classroom
    Clematis armandii tea — Stock Photo
    Clematis armandii tea
    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.
    Top view of whole and cut figs with juicy pulp on green foliage with veins on wooden surface — Stock Photo
    Top view of whole and cut figs with juicy pulp on green foliage with veins on wooden surface
    Cup of hot tea with honey, lemon and ginger next to eucalyptus stems in vase — Stock Photo
    Cup of hot tea with honey, lemon and ginger next to eucalyptus stems in vase
    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.
    Artichoke flower head — Stock Photo
    Artichoke flower head
    High palms covered with green foliage growing on glade in park of Safdarjung Mausoleum in New Delhi — Stock Photo
    High palms covered with green foliage growing on glade in park of Safdarjung Mausoleum in New Delhi
    Junior high students at computers listening to teacher at projection screen in classroom — Stock Photo
    Junior high students at computers listening to teacher at projection screen in classroom
    Girl students conducting scientific experiment, examining liquid in beaker in laboratory classroom — Stock Photo
    Girl students conducting scientific experiment, examining liquid in beaker in laboratory classroom
    Full body of cheerful female carrying wicker basket between blooming trees in garden looking away — Stock Photo
    Full body of cheerful female carrying wicker basket between blooming trees in garden looking away
    Frontenac Gris grapes growing on a vine; Shefford, Quebec, Canada — Stock Photo
    Frontenac Gris grapes growing on a vine; Shefford, Quebec, Canada
    Back view full body of anonymous female with raised hand carrying wicker basket between blooming trees in garden — Stock Photo
    Back view full body of anonymous female with raised hand carrying wicker basket between blooming trees in garden
    Overhead view of fresh tangerines — Stock Photo
    Overhead view of fresh tangerines
    Whole ripe green apple with foliage and pure small aqua drips on black background — Stock Photo
    Whole ripe green apple with foliage and pure small aqua drips on black background
    Colored scanning electron micrograph of human mesenchymal stem cell. — Stock Photo
    Colored scanning electron micrograph of human mesenchymal stem cell.
    Thin branch of oak tree with yellow withering leaves in center of dark room — Stock Photo
    Thin branch of oak tree with yellow withering leaves in center of dark room
    Beautiful hortensia flowers — Stock Photo
    Beautiful hortensia flowers
    Digital artwork of round blue cells on plain background. — Stock Photo
    Digital artwork of round blue cells on plain background.
    Female teacher and students examining DNA model in classroom — Stock Photo
    Female teacher and students examining DNA model in classroom
    Growing bush of aromatic purple lavender with bee pollinating flowers on sunny day against blurred background — Stock Photo
    Growing bush of aromatic purple lavender with bee pollinating flowers on sunny day against blurred background
    Close up of Glass of red wine and wine bottles on the background — Stock Photo
    Close up of Glass of red wine and wine bottles on the background
    Top view of tender pink flower petal near aromatic rosemary sprigs on rugged surface with spots — Stock Photo
    Top view of tender pink flower petal near aromatic rosemary sprigs on rugged surface with spots
    Close-up of ladybug larva in pupa stage on stem. — Stock Photo
    Close-up of ladybug larva in pupa stage on stem.
    Computer programmers high-fiving at laptop in office — Stock Photo
    Computer programmers high-fiving at laptop in office
    Top view of various types of succulent plants placed in pots on wooden table in light place — Stock Photo
    Top view of various types of succulent plants placed in pots on wooden table in light place
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom — Stock Photo
    Student in wheelchair examining fuel control valves on furnace in HVAC classroom
    Green and red haworthia plant with leaves and white dots in dark place — Stock Photo
    Green and red haworthia plant with leaves and white dots in dark place
    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