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    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).
    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).
    Section through a lily stem — Stock Photo
    Section through a lily stem
    Mid section of female florist arranging flowers in a bottle at her flower shop — Stock Photo
    Mid section of female florist arranging flowers in a bottle at her flower shop
    Close-up of noctuid moth on wild plant stem. — Stock Photo
    Close-up of noctuid moth on wild plant stem.
    Laboratory worker pipetting liquid into microcentrifuge tube. — Stock Photo
    Laboratory worker pipetting liquid into microcentrifuge tube.
    Lemon on stem with leaves — Stock Photo
    Lemon on stem with leaves
    Scientists viewing sample on glass slide under light microscope. — Stock Photo
    Scientists viewing sample on glass slide under light microscope.
    Scenery of hill covered with snow and bare shrubs growing in winter nature under cloudless blue sky — Stock Photo
    Scenery of hill covered with snow and bare shrubs growing in winter nature under cloudless blue sky
    Western sword fern — Stock Photo
    Western sword fern
    Small unripe cherry tomatoes growing on twig of plant in agricultural farm in rural area — Stock Photo
    Small unripe cherry tomatoes growing on twig of plant in agricultural farm in rural area
    Close-up view of a toadstool in moonlight — Stock Photo
    Close-up view of a toadstool in moonlight
    Top view of row of green and ripe cherry tomatoes showing ripening stage on white gauze — Stock Photo
    Top view of row of green and ripe cherry tomatoes showing ripening stage on white gauze
    Close up of small gray lizard looking out of trunk in the forest — Stock Photo
    Close up of small gray lizard looking out of trunk in the forest
    From above of whole green cherry tomatoes in bowl collected in farm during harvest season — Stock Photo
    From above of whole green cherry tomatoes in bowl collected in farm during harvest season
    Close-up of dried lotus flower, dark background — Stock Photo
    Close-up of dried lotus flower, dark background
    Blonde Girl at Kitchen Table Does School Work on Tablet Computer — Stock Photo
    Blonde Girl at Kitchen Table Does School Work on Tablet Computer
    Computer programmers programming virtual reality simulator glasses in office — Stock Photo
    Computer programmers programming virtual reality simulator glasses in office
    Computer programmers testing virtual reality simulator glasses in office — Stock Photo
    Computer programmers testing virtual reality simulator glasses in office
    Assorted mini ice creams on sticks, crushed — Stock Photo
    Assorted mini ice creams on sticks, crushed
    Fresh Grape Tomatoes — Stock Photo
    Fresh Grape Tomatoes
    Serrated tulip, X-ray, radiology scan — Stock Photo
    Serrated tulip, X-ray, radiology scan
    Rustic wooden box with glass vases and plants — Stock Photo
    Rustic wooden box with glass vases and plants
    Iceland, Sudurnes, Port of Reykjanesbaer. Fishing vessels in the hold dries. — Stock Photo
    Iceland, Sudurnes, Port of Reykjanesbaer. Fishing vessels in the hold dries.
    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
    Woman working in a large glasshouse — Stock Photo
    Woman working in a large glasshouse
    Female scientists working in laboratory — Stock Photo
    Female scientists working in laboratory
    Computer programmers and designers working at computers in open plan office — Stock Photo
    Computer programmers and designers working at computers in open plan office
    Thistle bud weevil sitting on plant stem. — Stock Photo
    Thistle bud weevil sitting on plant stem.
    Young attractive woman with fresh flower looking away and resting on bed in bedroom — Stock Photo
    Young attractive woman with fresh flower looking away and resting on bed in bedroom
    Young sensual female in black clothes with blossoming flower looking at camera — Stock Photo
    Young sensual female in black clothes with blossoming flower looking at camera
    Top view of bowl with fresh cherry tomatoes near rosemary stems and whole onion on wooden table — Stock Photo
    Top view of bowl with fresh cherry tomatoes near rosemary stems and whole onion on wooden table
    Crop unrecognizable ethnic female touching blossoming sunflower with pleasant aroma and gentle petals in countryside — Stock Photo
    Crop unrecognizable ethnic female touching blossoming sunflower with pleasant aroma and gentle petals in countryside
    Close-up of green Pacific tree frog sitting on plant stem. — Stock Photo
    Close-up of green Pacific tree frog sitting on plant stem.
    Student in wheelchair studying natural gas injector system on furnace with his classmate in HVAC classroom — Stock Photo
    Student in wheelchair studying natural gas injector system on furnace with his classmate in HVAC classroom
    Low angle of crop unrecognizable female carrying wicker basket with edible mushrooms in woods — Stock Photo
    Low angle of crop unrecognizable female carrying wicker basket with edible mushrooms in woods
    Woman standing in a garden holding a dahlia flower, Serbia — Stock Photo
    Woman standing in a garden holding a dahlia flower, Serbia
    Businesswomen with adhesive notes planning in office — Stock Photo
    Businesswomen with adhesive notes planning in office
    Curious boy examining DNA model in classroom — Stock Photo
    Curious boy examining DNA model in classroom
    Young attractive woman with fresh flower looking away and resting on bed in bedroom — Stock Photo
    Young attractive woman with fresh flower looking away and resting on bed in bedroom
    Top view of carnation stem and pile of petals on stone surface — Stock Photo
    Top view of carnation stem and pile of petals on stone surface
    Seedlings of parsley in small boxes with soil and inscription in countryside on sunny day — Stock Photo
    Seedlings of parsley in small boxes with soil and inscription in countryside on sunny day
    Digital illustration of human cells on blue background. — Stock Photo
    Digital illustration of human cells on blue background.
    Plants with peppers and wavy foliage on thin stalks growing in row in greenhouse — Stock Photo
    Plants with peppers and wavy foliage on thin stalks growing in row in greenhouse
    Closeup view of orange Nasturtium flower on white surface — Stock Photo
    Closeup view of orange Nasturtium flower on white surface
    Stack of ceramic plates and bowls with eucalyptus stems — Stock Photo
    Stack of ceramic plates and bowls with eucalyptus stems
    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
    Willow twigs with silvery catkins, close-up. — Stock Photo
    Willow twigs with silvery catkins, close-up.
    Students conducting scientific experiment in laboratory classroom — Stock Photo
    Students conducting scientific experiment in laboratory classroom
    Cropped image of woman studying pot with beautiful red chrysanthemum flowers in greenhouse — Stock Photo
    Cropped image of woman studying pot with beautiful red chrysanthemum flowers in greenhouse
    Overhead view of Glasses of red and white wine — Stock Photo
    Overhead view of Glasses of red and white wine
    Engineers working at computer in office — Stock Photo
    Engineers working at computer in office
    Palm leaves in warm sunset light — Stock Photo
    Palm leaves in warm sunset light
    Land snail covered by white frost on dry stem. — Stock Photo
    Land snail covered by white frost on dry stem.
    Junior high boy students using computers in computer lab — Stock Photo
    Junior high boy students using computers in computer lab
    Allium flower, X-ray. — Stock Photo
    Allium flower, X-ray.
    Closeup view of plum with droplets of water — Stock Photo
    Closeup view of plum with droplets of water
    Lime Martini in Fun Stem Glass — Stock Photo
    Lime Martini in Fun Stem Glass
    Stem cell cultures on weighed in laboratory. — Stock Photo
    Stem cell cultures on weighed in laboratory.
    Male teacher calling on students in classroom — Stock Photo
    Male teacher calling on students in classroom