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    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration — Stock Photo
    Plasmodium malariae protozoan inside red blood cells in the ring-form trophozoite stage, computer illustration
    Scenic view of frozen river surrounded by tall coniferous trees growing in snowy forest in winter — Stock Photo
    Scenic view of frozen river surrounded by tall coniferous trees growing in snowy forest in winter
    A Blacksmith Lapwing, Vanellus armatus, standing in a winding stream — Stock Photo
    A Blacksmith Lapwing, Vanellus armatus, standing in a winding stream
    People in small inflatable rib boat — Stock Photo
    People in small inflatable rib boat
    Empty pier and docks, coastal buildings and warehouse — Stock Photo
    Empty pier and docks, coastal buildings and warehouse
    Waves crashing against rocky shore on Pacific Ocean coastline. — Stock Photo
    Waves crashing against rocky shore on Pacific Ocean coastline.
    Protozoan Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration. — Stock Photo
    Protozoan Plasmodium falciparum, causative agent of tropical malaria in red blood cells, digital illustration.
    Kayaker running down falls at Johnston Canyon, Banff National Park, Alberta, Canada. — Stock Photo
    Kayaker running down falls at Johnston Canyon, Banff National Park, Alberta, Canada.
    Woman riding a mountain bike along a flow trail in a bike park, Glarus, Switzerland — Stock Photo
    Woman riding a mountain bike along a flow trail in a bike park, Glarus, Switzerland
    Fisherman in waders on a boat — Stock Photo
    Fisherman in waders on a boat
    Beach in lava flow near Criacao Velha, Faial island in the background. Pico Island, an island in the Azores (Ilhas dos Acores) in the Atlantic ocean. The Azores are an autonomous region of Portugal. Europe, Portugal, Azores — Stock Photo
    Beach in lava flow near Criacao Velha, Faial island in the background. Pico Island, an island in the Azores (Ilhas dos Acores) in the Atlantic ocean. The Azores are an autonomous region of Portugal. Europe, Portugal, Azores
    Cloudy sky with rainbow over Saint Mawes, Cornwall, UK. — Stock Photo
    Cloudy sky with rainbow over Saint Mawes, Cornwall, UK.
    Plasmodium ovale protozoan inside red blood cells at the ring-form trophozoite stage, computer illustration — Stock Photo
    Plasmodium ovale protozoan inside red blood cells at the ring-form trophozoite stage, computer illustration
    Person standing against powerful waterfall — Stock Photo
    Person standing against powerful waterfall
    Top view of hot red magma flowing on dark mountainous surface at night time in highland of Iceland in darkness — Stock Photo
    Top view of hot red magma flowing on dark mountainous surface at night time in highland of Iceland in darkness
    Human cytomegalovirus particles in blood flow, digital illustration. — Stock Photo
    Human cytomegalovirus particles in blood flow, digital illustration.
    Closeup view of tap water flowing to glass — Stock Photo
    Closeup view of tap water flowing to glass
    River and waterfall flowing through rural landscape, Vancouver Island, British Columbia, Canada — Stock Photo
    River and waterfall flowing through rural landscape, Vancouver Island, British Columbia, Canada
    Underwater view of diver wearing wet suit and flippers, sunlight filtering through from above. — Stock Photo
    Underwater view of diver wearing wet suit and flippers, sunlight filtering through from above.
    Picturesque landscape of calm river flowing among rocky mountains in Sierra de Guadarrama in Spain under cloudy sky in daytime — Stock Photo
    Picturesque landscape of calm river flowing among rocky mountains in Sierra de Guadarrama in Spain under cloudy sky in daytime
    Multi-colored nail polishes on colors geometric pattern background — Stock Photo
    Multi-colored nail polishes on colors geometric pattern background
    Silhouette of woman standing on a rock by the ocean at sunset. — Stock Photo
    Silhouette of woman standing on a rock by the ocean at sunset.
    Scenic view of Rainbow over Gullfoss Waterfall, Iceland — Stock Photo
    Scenic view of Rainbow over Gullfoss Waterfall, Iceland
    Back view of guy with backpack holding photo camera at beautiful canyon and calm river on sunny day on West Coast of USA — Stock Photo
    Back view of guy with backpack holding photo camera at beautiful canyon and calm river on sunny day on West Coast of USA
    Group of people in a rubber boat in the Antarctic. — Stock Photo
    Group of people in a rubber boat in the Antarctic.
    Man standing under a rainbow at Skogafoss waterfall, Iceland — Stock Photo
    Man standing under a rainbow at Skogafoss waterfall, Iceland
    View of iceberg along coastline — Stock Photo
    View of iceberg along coastline
    Boy standing on sandy beach — Stock Photo
    Boy standing on sandy beach
    Businessman talking on cell phone at desk in office — Stock Photo
    Businessman talking on cell phone at desk in office
    Pacaya Volcano lava flow — Stock Photo
    Pacaya Volcano lava flow
    Beautiful natural scene with forest and calm water at Jiuzhaigou Province, Sichuan Province, China — Stock Photo
    Beautiful natural scene with forest and calm water at Jiuzhaigou Province, Sichuan Province, China
    Powerful mountain river streaming through stones in bright sunny daytime in Switzerland — Stock Photo
    Powerful mountain river streaming through stones in bright sunny daytime in Switzerland
    Fat in blood cells blocking blood vessel, digital illustration. — Stock Photo
    Fat in blood cells blocking blood vessel, digital illustration.
    Rocky jagged coastline, eroded sandstone rock, view out to the ocean — Stock Photo
    Rocky jagged coastline, eroded sandstone rock, view out to the ocean
    Couple flyfishing in a river. — Stock Photo
    Couple flyfishing in a river.
    Scenic view of Oxararfoss waterfall, Thingvellir National Park, Iceland — Stock Photo
    Scenic view of Oxararfoss waterfall, Thingvellir National Park, Iceland
    Mountain biker carrying bicycle while crossing stream in forest — Stock Photo
    Mountain biker carrying bicycle while crossing stream in forest
    Senior man using peak flow meter and looking in camera. — Stock Photo
    Senior man using peak flow meter and looking in camera.
    Scenic view of Madakaripura Waterfall, East Java, Indonesia — Stock Photo
    Scenic view of Madakaripura Waterfall, East Java, Indonesia
    Distant tourist photographing Hrafnahjargafoss waterfall, Iceland — Stock Photo
    Distant tourist photographing Hrafnahjargafoss waterfall, Iceland
    Close-up shot of Coffee dripping from a coffee machine — Stock Photo
    Close-up shot of Coffee dripping from a coffee machine
    Elevated view of Aldeyjargoss waterfall with basalt cliffs, Iceland — Stock Photo
    Elevated view of Aldeyjargoss waterfall with basalt cliffs, Iceland
    Smiling young woman — Stock Photo
    Smiling young woman
    White blood cells with red blood cells, computer illustration. — Stock Photo
    White blood cells with red blood cells, computer illustration.
    Girl standing on rocks by a waterfall, United States — Stock Photo
    Girl standing on rocks by a waterfall, United States
    Scenic view of waterfall in forest, Spain — Stock Photo
    Scenic view of waterfall in forest, Spain
    From above of wavy tree twigs with dry leaves over river with foamy water flows in autumn in Lozoya, Madrid, Spain — Stock Photo
    From above of wavy tree twigs with dry leaves over river with foamy water flows in autumn in Lozoya, Madrid, Spain
    Close-up magma sparks out of the volcano hole in Iceland while you see people gazing at the rivers of lava — Stock Photo
    Close-up magma sparks out of the volcano hole in Iceland while you see people gazing at the rivers of lava
    Aged stone bridge over tranquil river on sunny day in picturesque autumn countryside — Stock Photo
    Aged stone bridge over tranquil river on sunny day in picturesque autumn countryside
    Scenic view of frozen river surrounded by tall coniferous trees growing in snowy forest in winter — Stock Photo
    Scenic view of frozen river surrounded by tall coniferous trees growing in snowy forest in winter
    Rocky jagged coastline, eroded sandstone rock, view out to the ocean — Stock Photo
    Rocky jagged coastline, eroded sandstone rock, view out to the ocean
    From above crop traveler in jeans and sneakers sitting on edge of bridge and dangling legs over river during hiking in spring forest park in Northern Ireland — Stock Photo
    From above crop traveler in jeans and sneakers sitting on edge of bridge and dangling legs over river during hiking in spring forest park in Northern Ireland
    Plasmodium malariae protozoa in blood vessel, computer illustration. — Stock Photo
    Plasmodium malariae protozoa in blood vessel, computer illustration.
    Person walking on rocky beach — Stock Photo
    Person walking on rocky beach
    Cascade on rocks of Tangle Falls waterfall in Jasper National Park, Alberta, Canada — Stock Photo
    Cascade on rocks of Tangle Falls waterfall in Jasper National Park, Alberta, Canada
    Senior man using peak flow meter on white background. — Stock Photo
    Senior man using peak flow meter on white background.
    Woman drinking ginger-lemongrass martini at a bar on the bank of a river. — Stock Photo
    Woman drinking ginger-lemongrass martini at a bar on the bank of a river.
    Scenic view to tropical waterfalls flowing — Stock Photo
    Scenic view to tropical waterfalls flowing
    A deserted beach, jagged rocks and rockpools on the Atlantic coast. — Stock Photo
    A deserted beach, jagged rocks and rockpools on the Atlantic coast.
    Crop anonymous female horticulturist watering blossoming plants with lush leaves in wooden box in house — Stock Photo
    Crop anonymous female horticulturist watering blossoming plants with lush leaves in wooden box in house