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    Leaf epidermis, light micrograph. Leaf epidermis has small pores, called stomata, which open up for photosynthetic gas exchange and transpiration. — Stock Photo
    Leaf epidermis, light micrograph. Leaf epidermis has small pores, called stomata, which open up for photosynthetic gas exchange and transpiration.
    Front view of mixed race female doctor in hijab consoling mature mixed race female patient in the ward at hospital. — Stock Photo
    Front view of mixed race female doctor in hijab consoling mature mixed race female patient in the ward at hospital.
    3d illustration of red blood cells erythrocytes. — Stock Photo
    3d illustration of red blood cells erythrocytes.
    Loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home — Stock Photo
    Loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home
    Female doctor putting oxygen mask on patient face in the hospital — Stock Photo
    Female doctor putting oxygen mask on patient face in the hospital
    Top view of crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic — Stock Photo
    Top view of crop unrecognizable doctor measuring blood oxygen of patient with heart rate monitor at table with stethoscope in clinic
    Female doctor putting oxygen mask on patient face in the hospital — Stock Photo
    Female doctor putting oxygen mask on patient face in the hospital
    Doctor and nurse pushing senior patient on stretcher in hospital corridor — Stock Photo
    Doctor and nurse pushing senior patient on stretcher in hospital corridor
    Scenic view of scuba divers silhouettes swimming under water — Stock Photo
    Scenic view of scuba divers silhouettes swimming under water
    Attentive male scientist working in laboratory — Stock Photo
    Attentive male scientist working in laboratory
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Female doctor putting oxygen mask on patient face in the hospital — Stock Photo
    Female doctor putting oxygen mask on patient face in the hospital
    Unrecognizable medic putting on mask on face of patient while preparing for cardiac stress test in modern hospital — Stock Photo
    Unrecognizable medic putting on mask on face of patient while preparing for cardiac stress test in modern hospital
    High angle of crop mother using nebulizer for inhalation of boy sitting in oxygen mask on sofa — Stock Photo
    High angle of crop mother using nebulizer for inhalation of boy sitting in oxygen mask on sofa
    Anesthesiologist holding oxygen mask over patient?s face in operating room — Stock Photo
    Anesthesiologist holding oxygen mask over patient?s face in operating room
    White engine of aircraft in azure heaven — Stock Photo
    White engine of aircraft in azure heaven
    High angle view of thoughtful mixed race female patient relaxing in bed in the ward at hospital. Woman is keeping her hands on chest. — Stock Photo
    High angle view of thoughtful mixed race female patient relaxing in bed in the ward at hospital. Woman is keeping her hands on chest.
    Doctor practicing bag-valve-mask ventilation on training dummy. — Stock Photo
    Doctor practicing bag-valve-mask ventilation on training dummy.
    Crop unrecognizable loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home — Stock Photo
    Crop unrecognizable loving mother with infrared thermometer measuring temperature of boy breathing in oxygen mask during inhalation procedure and watching cartoon on tablet at home
    Skin blood vessel. Coloured scanning electron micrograph (SEM) of a blood vessel (arteriole) in the dermis of the skin. In the blood vessel are red blood cells (erythrocytes, red) which carry oxygen around the body — Stock Photo
    Skin blood vessel. Coloured scanning electron micrograph (SEM) of a blood vessel (arteriole) in the dermis of the skin. In the blood vessel are red blood cells (erythrocytes, red) which carry oxygen around the body
    Boy home schooling with a medical mask on to protect from a virus — Stock Photo
    Boy home schooling with a medical mask on to protect from a virus
    Group of surgeons performing operation in operation theater of hospital — Stock Photo
    Group of surgeons performing operation in operation theater of hospital
    Team of doctors putting oxygen mask on a male senior patient face in the hospital — Stock Photo
    Team of doctors putting oxygen mask on a male senior patient face in the hospital
    Intensive care unit equipped with monitor corrugated tubes for oxygen and different medical tools in veterinary clinic — Stock Photo
    Intensive care unit equipped with monitor corrugated tubes for oxygen and different medical tools in veterinary clinic
    Front view of diverse female doctors interacting with mature mixed-race female patient in the ward at hospital. Female patient is looking relieved. — Stock Photo
    Front view of diverse female doctors interacting with mature mixed-race female patient in the ward at hospital. Female patient is looking relieved.
    Closeup of anonymous female patient using pulseoximeter to measure level of oxygen in blood while putting device on finger in room — Stock Photo
    Closeup of anonymous female patient using pulseoximeter to measure level of oxygen in blood while putting device on finger in room
    Close up of rapids in a mountain river with long exposure effect — Stock Photo
    Close up of rapids in a mountain river with long exposure effect
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Athlete in oxygen mask riding exercise bike with measuring of oxygen consumption. — Stock Photo
    Athlete in oxygen mask riding exercise bike with measuring of oxygen consumption.
    Doctor holding oxygen mask over patient, male doctor adjusting IV drip — Stock Photo
    Doctor holding oxygen mask over patient, male doctor adjusting IV drip
    Dark field light micrograph (LM) of freshwater pennate diatoms. — Stock Photo
    Dark field light micrograph (LM) of freshwater pennate diatoms.
    Team of doctors putting oxygen mask on a male senior patient face in the hospital — Stock Photo
    Team of doctors putting oxygen mask on a male senior patient face in the hospital
    Close up of thoughtful mixed race female patient relaxing in bed in the ward at hospital — Stock Photo
    Close up of thoughtful mixed race female patient relaxing in bed in the ward at hospital
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras — Stock Photo
    Scuba divers in Roatan Marine Park, West End Wall dive site; Roatan, Honduras
    Colored scanning electron micrograph of red blood cells. — Stock Photo
    Colored scanning electron micrograph of red blood cells.
    Female nurse holding oxygen mask over male patient's mouth in intensive care unit — Stock Photo
    Female nurse holding oxygen mask over male patient's mouth in intensive care unit
    From above content sick boy using respirator and breathing oxygen from inhaler while lying down on sofa at home — Stock Photo
    From above content sick boy using respirator and breathing oxygen from inhaler while lying down on sofa at home
    Anesthesiologist holding oxygen mask over patients face in operating room — Stock Photo
    Anesthesiologist holding oxygen mask over patients face in operating room
    Team of doctors putting oxygen mask on a male senior patient face in the hospital — Stock Photo
    Team of doctors putting oxygen mask on a male senior patient face in the hospital
    Surgeons adjusting oxygen mask on patient in operation theater of hospital — Stock Photo
    Surgeons adjusting oxygen mask on patient in operation theater of hospital
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Doctor and paramedics examining a patient in emergency room at hospital — Stock Photo
    Doctor and paramedics examining a patient in emergency room at hospital
    Surgeon holding oxygen mask in operation room at hospital — Stock Photo
    Surgeon holding oxygen mask in operation room at hospital
    Doctors pushing emergency stretcher bed in corridor at hospital — Stock Photo
    Doctors pushing emergency stretcher bed in corridor at hospital
    Crop unrecognizable veterinarian measuring pulse of cat with blood oxygen meter during operation in clinic — Stock Photo
    Crop unrecognizable veterinarian measuring pulse of cat with blood oxygen meter during operation in clinic
    Paramedics examining injured boy on street — Stock Photo
    Paramedics examining injured boy on street
    Senior woman with nasal cannula with eyes closed, close-up. — Stock Photo
    Senior woman with nasal cannula with eyes closed, close-up.
    Side view of little boy with asthma using inhaler while lying down on sofa at home — Stock Photo
    Side view of little boy with asthma using inhaler while lying down on sofa at home
    Side view of content sick boy using respirator and breathing oxygen from inhaler while sitting on sofa at home — Stock Photo
    Side view of content sick boy using respirator and breathing oxygen from inhaler while sitting on sofa at home
    Doctor putting on woman resuscitation mask. — Stock Photo
    Doctor putting on woman resuscitation mask.
    Close-up of oxygen cylinder in workshop — Stock Photo
    Close-up of oxygen cylinder in workshop
    Doctor with oximeter examining little patient — Stock Photo
    Doctor with oximeter examining little patient
    Surgeons performing operation in operation theater of hospital — Stock Photo
    Surgeons performing operation in operation theater of hospital
    Pilot in mask operating airplane during flight — Stock Photo
    Pilot in mask operating airplane during flight
    Side view of crop female vet with coworker in uniform standing at medical table with cat and tools during surgery — Stock Photo
    Side view of crop female vet with coworker in uniform standing at medical table with cat and tools during surgery
    Side view of little boy with asthma using inhaler while lying down on sofa at home — Stock Photo
    Side view of little boy with asthma using inhaler while lying down on sofa at home
    Cheerful child breathing in oxygen mask during inhalation and playing with soft toy on couch at home — Stock Photo
    Cheerful child breathing in oxygen mask during inhalation and playing with soft toy on couch at home
    Surgeons adjusting oxygen mask on patient in operation theater of hospital — Stock Photo
    Surgeons adjusting oxygen mask on patient in operation theater of hospital
    Doctor holding oxygen mask over male patient's mouth in intensive care unit — Stock Photo
    Doctor holding oxygen mask over male patient's mouth in intensive care unit
    Measuring oxygen levels in blood with pulse oximeter. — Stock Photo
    Measuring oxygen levels in blood with pulse oximeter.