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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).
    Hands of female researcher using micropipette and tubes. — Stock Photo
    Hands of female researcher using micropipette and tubes.
    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)
    Stem cell cultures on weighed in laboratory. — Stock Photo
    Stem cell cultures on weighed in laboratory.
    Tween girl looking into microscope with dog looking on — Stock Photo
    Tween girl looking into microscope with dog looking on
    Focused junior high girl student using computer in computer lab — Stock Photo
    Focused junior high girl student using computer in computer lab
    Female engineer planning, creating flow chart in office — Stock Photo
    Female engineer planning, creating flow chart in office
    Stem cell research — Stock Photo
    Stem cell research
    Student in wheelchair studying furnace electronic control system in HVAC classroom — Stock Photo
    Student in wheelchair studying furnace electronic control system in HVAC classroom
    Still life of bunch of green garlic on table — Stock Photo
    Still life of bunch of green garlic on table
    Meadow with dry plants — Stock Photo
    Meadow with dry plants
    Smiling female science teacher and girl student reading textbook at microscope in laboratory classroom — Stock Photo
    Smiling female science teacher and girl student reading textbook at microscope in laboratory classroom
    Teenage girl touching flowers in field — Stock Photo
    Teenage girl touching flowers in field
    Little boy looking into microscope at home — Stock Photo
    Little boy looking into microscope at home
    Sour cherry with stem and leaves — Stock Photo
    Sour cherry with stem and leaves
    Eucalyptus branches with gift tags, string and scissors — Stock Photo
    Eucalyptus branches with gift tags, string and scissors
    Seven spot ladybird walking on dried stem. — Stock Photo
    Seven spot ladybird walking on dried stem.
    Lime tree stem — Stock Photo
    Lime tree stem
    Clematis armandii tea — Stock Photo
    Clematis armandii tea
    Dreamy redhead female with long hair opening door of greenhouse with plants looking down — Stock Photo
    Dreamy redhead female with long hair opening door of greenhouse with plants looking down
    Closeup view of Glass vases with eucalyptus — Stock Photo
    Closeup view of Glass vases with eucalyptus
    Boy student examining DNA model in laboratory classroom — Stock Photo
    Boy student examining DNA model in laboratory classroom
    Portrait confident students holding molecular structures in laboratory classroom — Stock Photo
    Portrait confident students holding molecular structures in laboratory classroom
    Portrait of a Wallace's flying frog on a physalis plant, Indonesia — Stock Photo
    Portrait of a Wallace's flying frog on a physalis plant, Indonesia
    Back view woman standing on field with red flowers in sunny day — Stock Photo
    Back view woman standing on field with red flowers in sunny day
    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
    Stem cells dividing in bone marrow, digital illustration. — Stock Photo
    Stem cells dividing in bone marrow, digital illustration.
    Sincere child in gardening apron with watering pot and looking away against Alocasia in balcony while watering — Stock Photo
    Sincere child in gardening apron with watering pot and looking away against Alocasia in balcony while watering
    Organic red stalk chard — Stock Photo
    Organic red stalk chard
    Close up scientist holding specimen tray — Stock Photo
    Close up scientist holding specimen tray
    Curious students watching chemical reaction, conducting scientific experiment in laboratory classroom — Stock Photo
    Curious students watching chemical reaction, conducting scientific experiment in laboratory classroom
    From above of whole ripe cherry tomatoes on fresh rosemary sprigs with pleasant scent on wooden plate — Stock Photo
    From above of whole ripe cherry tomatoes on fresh rosemary sprigs with pleasant scent on wooden plate
    Shrimp Cocktail in Glass — Stock Photo
    Shrimp Cocktail in Glass
    Undifferentiated stem cells — Stock Photo
    Undifferentiated stem cells
    Dividing stem cells — Stock Photo
    Dividing stem cells
    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
    Student who had Spinal Meningitis in a science lab on his smart phone — Stock Photo
    Student who had Spinal Meningitis in a science lab on his smart phone
    Tall coniferous trees with lichen on trunks growing in dense woodland on cold weather in Cadiz Spain — Stock Photo
    Tall coniferous trees with lichen on trunks growing in dense woodland on cold weather in Cadiz Spain
    Green organic lemon — Stock Photo
    Green organic lemon
    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
    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
    Close-up of Geometrid moth caterpillar mimicking branch on wild plant stem. — Stock Photo
    Close-up of Geometrid moth caterpillar mimicking branch on wild plant stem.
    Portrait of an ant carrying a physalis, Indonesia — Stock Photo
    Portrait of an ant carrying a physalis, Indonesia
    Female scientist in clean suit researching coronavirus vaccine — Stock Photo
    Female scientist in clean suit researching coronavirus vaccine
    Peony flower (Paeonia officinalis), X-ray. — Stock Photo
    Peony flower (Paeonia officinalis), X-ray.
    Close-up of willow catkins on tree branch — Stock Photo
    Close-up of willow catkins on tree branch
    Smiling girl students assembling computer in classroom — Stock Photo
    Smiling girl students assembling computer in classroom
    From above bright red appetizing cherries with stems on pink background — Stock Photo
    From above bright red appetizing cherries with stems on pink background
    Siblings working on homeschool at kitchen table — Stock Photo
    Siblings working on homeschool at kitchen table
    Swiss Chard at a organic farmer s market — Stock Photo
    Swiss Chard at a organic farmer s market
    Small white butterfly on fresh stem. — Stock Photo
    Small white butterfly on fresh stem.
    Curious girl student holding molecule model in classroom — Stock Photo
    Curious girl student holding molecule model in classroom
    Colored human embryonic stem cells, digital illustration. — Stock Photo
    Colored human embryonic stem cells, digital illustration.
    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
    Focused junior high boy student using computer in computer lab — Stock Photo
    Focused junior high boy student using computer in computer lab
    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).
    Green spinach foliage with veins and stems in bowl on white surface — Stock Photo
    Green spinach foliage with veins and stems in bowl on white surface
    Female engineer with digital tablet working in office — Stock Photo
    Female engineer with digital tablet working in office
    Butterfly and snail on a flower, Indonesia — Stock Photo
    Butterfly and snail on a flower, Indonesia
    Overhead view of a rustic place setting with eucalyptus stems — Stock Photo
    Overhead view of a rustic place setting with eucalyptus stems