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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)
    Side view of female with closed eyes enjoying sunny day on grassy meadow in countryside — Stock Photo
    Side view of female with closed eyes enjoying sunny day on grassy meadow in countryside
    Colored scanning electron micrograph of human mesenchymal stem cell. — Stock Photo
    Colored scanning electron micrograph of human mesenchymal stem cell.
    Dividing stem cells — Stock Photo
    Dividing stem cells
    Close-up of transparent glass vases with bunches of fresh flowers placed on table for event — Stock Photo
    Close-up of transparent glass vases with bunches of fresh flowers placed on table for event
    Curious students watching chemical reaction, conducting scientific experiment in laboratory classroom — Stock Photo
    Curious students watching chemical reaction, conducting scientific experiment in laboratory classroom
    Top view of heap of whole small green apples with leaves in basket on wooden surface — Stock Photo
    Top view of heap of whole small green apples with leaves in basket on wooden surface
    Human midbrain, illustration — Stock Photo
    Human midbrain, illustration
    Closeup of furled fiddle head fern with tender leaves on blurred background — Stock Photo
    Closeup of furled fiddle head fern with tender leaves on blurred background
    Digital artwork of round blue cells on plain background. — Stock Photo
    Digital artwork of round blue cells on plain 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
    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
    Side view of female with grapes lying near basket of flowers placed near croissant and strawberries during picnic in countryside — Stock Photo
    Side view of female with grapes lying near basket of flowers placed near croissant and strawberries during picnic in countryside
    Female surrounded by fresh flowers growing on tree branches in garden looking away — Stock Photo
    Female surrounded by fresh flowers growing on tree branches in garden looking away
    Close-up of served festive table with crystal glasses cutlery napkin on plate near bunch of fresh flowers for wedding — Stock Photo
    Close-up of served festive table with crystal glasses cutlery napkin on plate near bunch of fresh flowers for wedding
    Portrait confident students holding molecular structures in laboratory classroom — Stock Photo
    Portrait confident students holding molecular structures in laboratory classroom
    From above of fresh raw leeks with green stems placed on black surface — Stock Photo
    From above of fresh raw leeks with green stems placed on black surface
    Dragonfly (Odonata), Bigodi Wetland Sanctuary, Bwindi Impenetrable Forest; Western Region, Uganda — Stock Photo
    Dragonfly (Odonata), Bigodi Wetland Sanctuary, Bwindi Impenetrable Forest; Western Region, Uganda
    Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (grey) and large intercellular air spaces (holes). — Stock Photo
    Coloured scanning electron micrograph (SEM) of a freeze-fractured water lily stem showing numerous vascular bundles (grey) and large intercellular air spaces (holes).
    Tender young female with shade on face against blossoming flower on thin stem with foliage on black background — Stock Photo
    Tender young female with shade on face against blossoming flower on thin stem with foliage on black background
    Milk cap mushroom growing in woods covered with fallen dry foliage in autumn day — Stock Photo
    Milk cap mushroom growing in woods covered with fallen dry foliage in autumn day
    Mid section of female florist cutting flower stem with scissors — Stock Photo
    Mid section of female florist cutting flower stem with scissors
    Computer programmers testing virtual reality simulator glasses at computer in office — Stock Photo
    Computer programmers testing virtual reality simulator glasses at computer in office
    Close-up of technician storing stem cell samples in cryostorage. — Stock Photo
    Close-up of technician storing stem cell samples in cryostorage.
    High angle of transparent glass vases with bunches of fresh flowers placed on table for event — Stock Photo
    High angle of transparent glass vases with bunches of fresh flowers placed on table for event
    Male teacher and boy student using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Male teacher and boy student using microscope, conducting scientific experiment in laboratory classroom
    From above of branch of tree with green lichen on ground covered with dry foliage in autumn forest — Stock Photo
    From above of branch of tree with green lichen on ground covered with dry foliage in autumn forest
    Old rustic box on linen tablecloth with wooden kitchen utensils — Stock Photo
    Old rustic box on linen tablecloth with wooden kitchen utensils
    Crop view of male in orange shirt holding dark elegant stem glass with white Nordic beverage sprinkled with powder and dried flowers on blurred background — Stock Photo
    Crop view of male in orange shirt holding dark elegant stem glass with white Nordic beverage sprinkled with powder and dried flowers on blurred background
    Brothers standing proud with their homemade volcanos — Stock Photo
    Brothers standing proud with their homemade volcanos
    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
    Bigleaf maple leaf (Acer macrophyllum) in autumn, in small tree branch — Stock Photo
    Bigleaf maple leaf (Acer macrophyllum) in autumn, in small tree branch
    Young female scientist viewing microscope during research. — Stock Photo
    Young female scientist viewing microscope during research.
    View of boy programming at computer in classroom on digital camera viewfinder — Stock Photo
    View of boy programming at computer in classroom on digital camera viewfinder
    Female engineers testing robotic arm in office — Stock Photo
    Female engineers testing robotic arm in office
    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
    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
    Pieces of fresh green Aloe Vera on white background — Stock Photo
    Pieces of fresh green Aloe Vera on white background
    Close-up of nursery web spider on squirting cucumber stem. — Stock Photo
    Close-up of nursery web spider on squirting cucumber stem.
    Closeup green tomato ripening with raindrops on branches of plant growing in agricultural field in countryside — Stock Photo
    Closeup green tomato ripening with raindrops on branches of plant growing in agricultural field in countryside
    Tomato plants growing in a polytunnel. — Stock Photo
    Tomato plants growing in a polytunnel.
    Blooming red and white dahlia flowers — Stock Photo
    Blooming red and white dahlia flowers
    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
    From above of festive stylish decorative Christmas bouquet with twigs of eucalyptus and bright red branches with berries placed on wooden table in room — Stock Photo
    From above of festive stylish decorative Christmas bouquet with twigs of eucalyptus and bright red branches with berries placed on wooden table in room
    Woody stem section. Coloured scanning electron micrograph (SEM) of a transverse section through the stem of a woody plant. The majority of tissue seen here is secondary xylem (dark brown) — Stock Photo
    Woody stem section. Coloured scanning electron micrograph (SEM) of a transverse section through the stem of a woody plant. The majority of tissue seen here is secondary xylem (dark brown)
    Close-up view of Swiss Chard Leaf — Stock Photo
    Close-up view of Swiss Chard Leaf
    Student in wheelchair studying furnace electronic control system in HVAC classroom — Stock Photo
    Student in wheelchair studying furnace electronic control system in HVAC classroom
    Pensive, curious girl student examining molecular structure — Stock Photo
    Pensive, curious girl student examining molecular structure
    Girl student programming and assembling robotics in classroom — Stock Photo
    Girl student programming and assembling robotics in classroom
    Pink cherry blossom, scissors and string — Stock Photo
    Pink cherry blossom, scissors and string
    Woman standing in a garden holding a dahlia flower, Serbia — Stock Photo
    Woman standing in a garden holding a dahlia flower, Serbia
    Young woman sitting on grassy field on blanket with dandelion stem. — Stock Photo
    Young woman sitting on grassy field on blanket with dandelion stem.
    Female researcher using micropipette and tubes in laboratory, close-up. — Stock Photo
    Female researcher using micropipette and tubes in laboratory, close-up.
    Javan tree frog on a plant, Indonesia — Stock Photo
    Javan tree frog on a plant, Indonesia
    Festive stylish decorative Christmas bouquet with twigs of eucalyptus and bright red branches with berries placed on wooden table in room — Stock Photo
    Festive stylish decorative Christmas bouquet with twigs of eucalyptus and bright red branches with berries placed on wooden table in room
    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
    Junior high students using computers in computer lab — Stock Photo
    Junior high students using computers in computer lab
    Close up male scientist with test tube studying coronavirus vaccine — Stock Photo
    Close up male scientist with test tube studying coronavirus vaccine
    Close up scientist in rubber gloves placing specimen in centrifuge — Stock Photo
    Close up scientist in rubber gloves placing specimen in centrifuge
    Female researcher using light microscope for examining stem cells in culture jar. — Stock Photo
    Female researcher using light microscope for examining stem cells in culture jar.