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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)
    Instructor demonstrating air conditioner control system on demo board to students in HVAC classroom one student in wheelchair — Stock Photo
    Instructor demonstrating air conditioner control system on demo board to students in HVAC classroom one student in wheelchair
    Girl students using microscope, conducting scientific experiment in laboratory classroom — Stock Photo
    Girl students using microscope, conducting scientific experiment in laboratory classroom
    Low angle of high leafless tree trunk growing against lush coniferous plant under blue sky with clouds — Stock Photo
    Low angle of high leafless tree trunk growing against lush coniferous plant under blue sky with clouds
    A pair of adult bald eagles sitting on a bare branch together — Stock Photo
    A pair of adult bald eagles sitting on a bare branch together
    Junior high students working at computers in computer lab — Stock Photo
    Junior high students working at computers in computer lab
    Close up profile girl student using microscope, conducting scientific experiment — Stock Photo
    Close up profile girl student using microscope, conducting scientific experiment
    Medium tray with cells and DNA autoradiogram for scientific research. — Stock Photo
    Medium tray with cells and DNA autoradiogram for scientific research.
    Bigleaf maple leaf (Acer macrophyllum) in autumn, in small tree branch — Stock Photo
    Bigleaf maple leaf (Acer macrophyllum) in autumn, in small tree branch
    Wine connoisseur holding up glass of wine — Stock Photo
    Wine connoisseur holding up glass of wine
    Human brain anatomy, 3D illustration. Lobes of the brain are colour-coded: frontal lobe (Pink), parietal lobe (blue), occipital lobe (orange) and temporal lobe (yellow). — Stock Photo
    Human brain anatomy, 3D illustration. Lobes of the brain are colour-coded: frontal lobe (Pink), parietal lobe (blue), occipital lobe (orange) and temporal lobe (yellow).
    Tropical jungle Monstera leaf — Stock Photo
    Tropical jungle Monstera leaf
    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
    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
    Illustration of pink stem cell on black background. — Stock Photo
    Illustration of pink stem cell on black background.
    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.
    Close-up of peaches on peach tree in garden — Stock Photo
    Close-up of peaches on peach tree in garden
    Fresh vegetables in the market — Stock Photo
    Fresh vegetables in the market
    Visual rendering of human brain — Stock Photo
    Visual rendering of human brain
    Cute brother and sister collecting vegetalbes — Stock Photo
    Cute brother and sister collecting vegetalbes
    Lemon in dish of salt — Stock Photo
    Lemon in dish of salt
    Top view of raw royal champignons and stems of green asparagus on parchment prepared for cooking healthy dinner — Stock Photo
    Top view of raw royal champignons and stems of green asparagus on parchment prepared for cooking healthy dinner
    Seven spot ladybird sitting on dried stem. — Stock Photo
    Seven spot ladybird sitting on dried stem.
    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
    Junior high students and teachers using computers in computer lab — Stock Photo
    Junior high students and teachers using computers in computer lab
    Green fern frond against empty road and gloomy woodland — Stock Photo
    Green fern frond against empty road and gloomy woodland
    Peony flower (Paeonia officinalis), X-ray. — Stock Photo
    Peony flower (Paeonia officinalis), X-ray.
    Texture of dry fallen yellow autumn leaf with thin veins and stem against blurred gray background — Stock Photo
    Texture of dry fallen yellow autumn leaf with thin veins and stem against blurred gray background
    Tween girl looking into microscope with dog looking on — Stock Photo
    Tween girl looking into microscope with dog looking on
    Person strolling on dry meadow against misty trees in nature in winter day — Stock Photo
    Person strolling on dry meadow against misty trees in nature in winter day
    Top view of pair of worn brown leather shoes placed on grassy lawn in nature — Stock Photo
    Top view of pair of worn brown leather shoes placed on grassy lawn in nature
    Businesswomen with adhesive notes planning in office — Stock Photo
    Businesswomen with adhesive notes planning in office
    Closeup of fern stem on blurred background — Stock Photo
    Closeup of fern stem on blurred background
    Two frogs on a plant, Indonesia — Stock Photo
    Two frogs on a plant, Indonesia
    Cute tree frog sitting on flowers stem, blurred background — Stock Photo
    Cute tree frog sitting on flowers stem, blurred background
    Designers working in open plan office — Stock Photo
    Designers working in open plan office
    Girl examining mealworm under microscope — Stock Photo
    Girl examining mealworm under microscope
    Scientist in rubber gloves filling pipette tray in laboratory — Stock Photo
    Scientist in rubber gloves filling pipette tray in laboratory
    Boy amidst plants — Stock Photo
    Boy amidst plants
    Stem of green asparagus on fork — Stock Photo
    Stem of green asparagus on fork
    Curious, smiling students watching chemical reaction, conducting scientific experiment in laboratory classroom — Stock Photo
    Curious, smiling students watching chemical reaction, conducting scientific experiment in laboratory classroom
    Lemon on stem with leaves — Stock Photo
    Lemon on stem with leaves
    From above of festive Christmas bouquet with branches of cotton, fir and twigs of eucalyptus and bright red branches with berries placed on wooden table with candles in room — Stock Photo
    From above of festive Christmas bouquet with branches of cotton, fir and twigs of eucalyptus and bright red branches with berries placed on wooden table with candles in room
    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.
    Illustration of pink stem cell on blue background. — Stock Photo
    Illustration of pink stem cell on blue background.
    Close Up Of A Taro Leaf; Maui, Hawaii, United States Of America — Stock Photo
    Close Up Of A Taro Leaf; Maui, Hawaii, United States Of America
    Top view of raw cut Boletus edulis mushrooms on wooden chopping board with garlic and parsley in light kitchen during cooking process — Stock Photo
    Top view of raw cut Boletus edulis mushrooms on wooden chopping board with garlic and parsley in light kitchen during cooking process
    Snail crawling up plant — Stock Photo
    Snail crawling up plant
    Bowl and bundle of small decorative berries during festive occasion in restaurant — Stock Photo
    Bowl and bundle of small decorative berries during festive occasion in restaurant
    Close-up of white and green broccoli in bowl — Stock Photo
    Close-up of white and green broccoli in bowl
    Focused boy student in goggles soldering circuit board in classroom — Stock Photo
    Focused boy student in goggles soldering circuit board in classroom
    Texture of dry fallen orange autumn leaf with thin veins and stem against blurred gray background — Stock Photo
    Texture of dry fallen orange autumn leaf with thin veins and stem against blurred gray background
    Leafless branch with spring buds — Stock Photo
    Leafless branch with spring buds
    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 hymenopteran insect hanging on plant stem. — Stock Photo
    Close-up of hymenopteran insect hanging on plant stem.
    Computer programmers testing virtual reality simulator glasses in office — Stock Photo
    Computer programmers testing virtual reality simulator glasses in office
    Butterfly and snail on a flower, Indonesia — Stock Photo
    Butterfly and snail on a flower, Indonesia
    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
    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
    Female florist trimming flower stems at her flower shop — Stock Photo
    Female florist trimming flower stems at her flower shop