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    Male teacher leading physics lesson at whiteboard in classroom — Stock Photo
    Male teacher leading physics lesson at whiteboard in classroom
    Close-up of Idas blue butterfly on arc shaped stem. — Stock Photo
    Close-up of Idas blue butterfly on arc shaped stem.
    Fresh fragrant stems of narrow leaved black peppermint tree and rosemary placed on metal buckets with Loropetalum plant leaves in flower market — Stock Photo
    Fresh fragrant stems of narrow leaved black peppermint tree and rosemary placed on metal buckets with Loropetalum plant leaves in flower market
    Blonde Girl at Kitchen Table Does School Work on Tablet Computer — Stock Photo
    Blonde Girl at Kitchen Table Does School Work on Tablet Computer
    Achilles morpho butterfly on thorny green stem; Iguazu Falls, Parana, Brazil — Stock Photo
    Achilles morpho butterfly on thorny green stem; Iguazu Falls, Parana, Brazil
    Computer programmers programming virtual reality simulator glasses at computer in office — Stock Photo
    Computer programmers programming virtual reality simulator glasses at computer in office
    From above of creamy hummus with tiny octopus and calamari garnished with paprika and pine nuts with sesame seeds and green with oil — Stock Photo
    From above of creamy hummus with tiny octopus and calamari garnished with paprika and pine nuts with sesame seeds and green with oil
    From above of whole green and red cherry tomatoes in bowl collected in farm during harvest season — Stock Photo
    From above of whole green and red cherry tomatoes in bowl collected in farm during harvest season
    Dense evergreen forest with covered by moss tall redwoods in Big Basin Redwoods State Park in USA — Stock Photo
    Dense evergreen forest with covered by moss tall redwoods in Big Basin Redwoods State Park in USA
    Closeup view of Glass vases with eucalyptus — Stock Photo
    Closeup view of Glass vases with eucalyptus
    Man holding up goblet — Stock Photo
    Man holding up goblet
    Boy students examining liquid in test tube, conducting scientific experiment in laboratory classroom — Stock Photo
    Boy students examining liquid in test tube, conducting scientific experiment in laboratory classroom
    Overhead view of tasty ripe fig slices with aromatic thyme sprigs on baking paper — Stock Photo
    Overhead view of tasty ripe fig slices with aromatic thyme sprigs on baking paper
    Close-up of green plant leaves along stem. — Stock Photo
    Close-up of green plant leaves along stem.
    Male teacher helping girl student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Male teacher helping girl student using microscope, conducting scientific experiment in laboratory classroom
    Female teacher and curious girl students examining molecular structure in laboratory classroom — Stock Photo
    Female teacher and curious girl students examining molecular structure in laboratory classroom
    Focused girl student assembling circuit board in classroom — Stock Photo
    Focused girl student assembling circuit board in classroom
    Lemon on stem with leaves — Stock Photo
    Lemon on stem with leaves
    Lily flower anther — Stock Photo
    Lily flower anther
    Overhead view of bright fresh tangerines with green foliage in rectangular shaped container on wooden table — Stock Photo
    Overhead view of bright fresh tangerines with green foliage in rectangular shaped container on wooden table
    Row of green and ripe cherry tomatoes showing ripening stage on white gauze — Stock Photo
    Row of green and ripe cherry tomatoes showing ripening stage on white gauze
    Scientists viewing sample on glass slide under light microscope. — Stock Photo
    Scientists viewing sample on glass slide under light microscope.
    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
    Single cherry tomato close-up view — Stock Photo
    Single cherry tomato close-up view
    Still life of bunch of green garlic on table — Stock Photo
    Still life of bunch of green garlic on table
    Colored scanning electron micrograph of human mesenchymal stem cell. — Stock Photo
    Colored scanning electron micrograph of human mesenchymal stem cell.
    Curious girl student holding molecule model in classroom — Stock Photo
    Curious girl student holding molecule model in classroom
    Ripe wheat stems in field in summertime — Stock Photo
    Ripe wheat stems in field in summertime
    Female teacher and students examining DNA model in classroom — Stock Photo
    Female teacher and students examining DNA model in classroom
    Girl holding a dandelion — Stock Photo
    Girl holding a dandelion
    Cluster fly sitting on dried wildflower stem. — Stock Photo
    Cluster fly sitting on dried wildflower stem.
    Adult female traveler with lush green plant leaf looking away during trip in woods — Stock Photo
    Adult female traveler with lush green plant leaf looking away during trip in woods
    Close-up of ballet shoes and roses on stage — Stock Photo
    Close-up of ballet shoes and roses on stage
    Junior high boy students using computer in computer lab — Stock Photo
    Junior high boy students using computer in computer lab
    Focused male engineer with screwdriver fixing robotic arm — Stock Photo
    Focused male engineer with screwdriver fixing robotic arm
    Unripe and ripe cherry tomatoes growing on twig of plant in agricultural farm in rural area — Stock Photo
    Unripe and ripe cherry tomatoes growing on twig of plant in agricultural farm in rural area
    White-lipped tree frog on a plant stem, Indonesia — Stock Photo
    White-lipped tree frog on a plant stem, Indonesia
    Idas blue butterfly sitting on dried stem. — Stock Photo
    Idas blue butterfly sitting on dried stem.
    From above of fresh ripe purple onions with green stems placed on black table — Stock Photo
    From above of fresh ripe purple onions with green stems placed on black table
    Dandelion seeds blowing in wind at summer day — Stock Photo
    Dandelion seeds blowing in wind at summer day
    Leaves branching off a stem — Stock Photo
    Leaves branching off a stem
    Surprised students conducting exploding foam scientific experiment in classroom laboratory — Stock Photo
    Surprised students conducting exploding foam scientific experiment in classroom laboratory
    Human embryonic stem cells, digital illustration. — Stock Photo
    Human embryonic stem cells, digital illustration.
    Close-up of camouflaged caterpillar on dried stem of wild plant. — Stock Photo
    Close-up of camouflaged caterpillar on dried stem of wild plant.
    A Single Whole Tomatillo with a Stem with green blurred background — Stock Photo
    A Single Whole Tomatillo with a Stem with green blurred background
    Girl students using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl students using microscope, conducting scientific experiment in laboratory classroom
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    High angle of inflorescence of Solanum lycopersicum growing in green leaves cultivated in agricultural farm in sunny day — Stock Photo
    High angle of inflorescence of Solanum lycopersicum growing in green leaves cultivated in agricultural farm in sunny day
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    Human embryonic stem cell, digital illustration. — Stock Photo
    Human embryonic stem cell, digital illustration.
    Dividing stem cells — Stock Photo
    Dividing stem cells
    Designers working in open plan office — Stock Photo
    Designers working in open plan office
    Head on view of little boy looking at bug under microscope — Stock Photo
    Head on view of little boy looking at bug under microscope
    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
    From above minimalistic still life composition with green cactus stems placed on round tortilla chip on yellow background — Stock Photo
    From above minimalistic still life composition with green cactus stems placed on round tortilla chip on yellow background
    Branch of spruce with thin needles with melting snow in forest in winter day — Stock Photo
    Branch of spruce with thin needles with melting snow in forest in winter day
    Bowl of freshly peas. — Stock Photo
    Bowl of freshly peas.
    Crop view of hand elegantly taking green stem of ripe juicy strawberry from small bowl full of red berries on wooden table — Stock Photo
    Crop view of hand elegantly taking green stem of ripe juicy strawberry from small bowl full of red berries on wooden table
    Rustic composition of green stem on board with rough fabric and oat grains on wooden table — Stock Photo
    Rustic composition of green stem on board with rough fabric and oat grains on wooden table
    Colored scanning electron micrograph of stem cell-derived motor neuron cell. — Stock Photo
    Colored scanning electron micrograph of stem cell-derived motor neuron cell.