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    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow) — Stock Photo
    Lily stem. Light micrograph(LM) of section through part of lily (Lilium) stem. Thin outer epidermis surrounds layer of cortex. At center is pith, which contains numerous vascular bundles (yellow)
    Beautiful blooming yellow wildflowers and sunset — Stock Photo
    Beautiful blooming yellow wildflowers and sunset
    Students examining liquid in test tube, conducting scientific experiment in laboratory classroom — Stock Photo
    Students examining liquid in test tube, conducting scientific experiment in laboratory classroom
    Close-up of fungus infecting caterpillar on plant stem. — Stock Photo
    Close-up of fungus infecting caterpillar on plant stem.
    Focused girl student programming robotics at laptop in classroom — Stock Photo
    Focused girl student programming robotics at laptop in classroom
    Illustration of pink stem cell on blue background. — Stock Photo
    Illustration of pink stem cell on blue background.
    Lime tree stem — Stock Photo
    Lime tree stem
    Smiling female science teacher leading lesson at projection screen in classroom — Stock Photo
    Smiling female science teacher leading lesson at projection screen in classroom
    Bouquet of fresh flowers including white lilies eustoma and aster in glass vase at sunshine — Stock Photo
    Bouquet of fresh flowers including white lilies eustoma and aster in glass vase at sunshine
    Curious students watching chemical reaction, conducting scientific experiment in laboratory classroom — Stock Photo
    Curious students watching chemical reaction, conducting scientific experiment in laboratory classroom
    Scientists preparing blood sample for analysis under light microscope. — Stock Photo
    Scientists preparing blood sample for analysis under light microscope.
    Fresh vegetables in the market — Stock Photo
    Fresh vegetables in the market
    Plant with thin stem and tiny pure water drops on curved leaf growing in woods on blurred background — Stock Photo
    Plant with thin stem and tiny pure water drops on curved leaf growing in woods on blurred background
    Close up of green peas — Stock Photo
    Close up of green peas
    Broccoli on wooden table — Stock Photo
    Broccoli on wooden table
    Medium tray with cells and DNA autoradiogram for scientific research. — Stock Photo
    Medium tray with cells and DNA autoradiogram for scientific research.
    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
    Closeup of fern stems in forest background — Stock Photo
    Closeup of fern stems in forest background
    Female engineer planning, creating flow chart in office — Stock Photo
    Female engineer planning, creating flow chart in office
    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
    Green organic lemon — Stock Photo
    Green organic lemon
    Young Girl Dropping Parachute from Outdoor Stadium Stairs — Stock Photo
    Young Girl Dropping Parachute from Outdoor Stadium Stairs
    Junior high students using computers in computer lab — Stock Photo
    Junior high students using computers in computer lab
    Computer programmers programming virtual reality simulator glasses in office — Stock Photo
    Computer programmers programming virtual reality simulator glasses in office
    Monarch Butterfly Caterpillar (Danaus Plexippus) On Leaf, Shirley Richardson Butterfly Garden; Winnipeg, Manitoba, Canada — Stock Photo
    Monarch Butterfly Caterpillar (Danaus Plexippus) On Leaf, Shirley Richardson Butterfly Garden; Winnipeg, Manitoba, Canada
    High angle of acoustic guitar and ukulele placed on green grass growing in nature in summer time in daylight — Stock Photo
    High angle of acoustic guitar and ukulele placed on green grass growing in nature in summer time in daylight
    Beautiful hortensia flowers — Stock Photo
    Beautiful hortensia flowers
    Land snail covered by white frost on dry stem. — Stock Photo
    Land snail covered by white frost on dry stem.
    Instructor demonstrating air conditioner recharging manifold with gauges in HVAC classroom student in wheelchair — Stock Photo
    Instructor demonstrating air conditioner recharging manifold with gauges in HVAC classroom student in wheelchair
    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
    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.
    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
    Computer programmers testing virtual reality simulator glasses in open plan office — Stock Photo
    Computer programmers testing virtual reality simulator glasses in open plan office
    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
    Black and white closeup of dried plant sprigs with wavy stems on transparent aqua drips on blurred background — Stock Photo
    Black and white closeup of dried plant sprigs with wavy stems on transparent aqua drips on blurred background
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured Nasturtium stem, showing numerous vascular bundles (such as at upper centre) with an inner xylem (pink) and outer phloem (yellow).
    Ceramic cup with fresh blooming flowers placed on wooden table in restaurant in daylight — Stock Photo
    Ceramic cup with fresh blooming flowers placed on wooden table in restaurant in daylight
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    Forkful of Tagliatelle with stem broccoli on rustic surface — Stock Photo
    Forkful of Tagliatelle with stem broccoli on rustic surface
    Instructor discussing air conditioner recharging with student in wheelchair in HVAC classroom — Stock Photo
    Instructor discussing air conditioner recharging with student in wheelchair in HVAC classroom
    Junior high students at computers watching teacher at projection screen in classroom — Stock Photo
    Junior high students at computers watching teacher at projection screen in classroom
    Illustration of pink stem cell on black background. — Stock Photo
    Illustration of pink stem cell on black background.
    Raw buna shimeji with curved stems and rounded white caps on rugged gray surface — Stock Photo
    Raw buna shimeji with curved stems and rounded white caps on rugged gray surface
    Male teacher and girl students conducting scientific experiment at microscope and laptop in laboratory classroom — Stock Photo
    Male teacher and girl students conducting scientific experiment at microscope and laptop in laboratory classroom
    Student setting up generator experiment with professor while student in wheelchair examines HVAC system — Stock Photo
    Student setting up generator experiment with professor while student in wheelchair examines HVAC system
    Computer programmers programming virtual reality simulator glasses in open plan office — Stock Photo
    Computer programmers programming virtual reality simulator glasses in open plan office
    High angle of bowl with fresh cherry tomatoes near rosemary stems and whole onion on wooden table — Stock Photo
    High angle of bowl with fresh cherry tomatoes near rosemary stems and whole onion on wooden table
    Student examining electrical control system on furnace with professor in HVAC classroom one student in wheelchair — Stock Photo
    Student examining electrical control system on furnace with professor in HVAC classroom one student in wheelchair
    Tomato plants growing in a polytunnel. — Stock Photo
    Tomato plants growing in a polytunnel.
    Eucalyptus stems with gift tags, string and scissors — Stock Photo
    Eucalyptus stems with gift tags, string and scissors
    Female engineers testing robotic arm in office — Stock Photo
    Female engineers testing robotic arm in office
    Abstract background of growing green cactus covered with even rows of sharp prickles — Stock Photo
    Abstract background of growing green cactus covered with even rows of sharp prickles
    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
    Green thin trunks of high trees growing together in grove — Stock Photo
    Green thin trunks of high trees growing together in grove
    Computer programmers working in open plan office — Stock Photo
    Computer programmers working in open plan office
    Crop anonymous person touching plant twig with frost on thin leaves on blurred background — Stock Photo
    Crop anonymous person touching plant twig with frost on thin leaves on blurred background
    Cute boy and girl drawing at home — Stock Photo
    Cute boy and girl drawing at home
    Crop anonymous person putting sunflowers on wooden stool in studio with black wall — Stock Photo
    Crop anonymous person putting sunflowers on wooden stool in studio with black wall
    Smiling male teacher and students programming robotics at laptop in classroom — Stock Photo
    Smiling male teacher and students programming robotics at laptop in classroom
    Crop male hand holding bunch of garlic against table — Stock Photo
    Crop male hand holding bunch of garlic against table