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    Giardia lamblia, a protozoan (cyst stage) found in water contaminated by animal faeces, coloured scanning electron micrograph (SEM). — Stock Photo
    Giardia lamblia, a protozoan (cyst stage) found in water contaminated by animal faeces, coloured scanning electron micrograph (SEM).
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Endictya oceanica diatom — Stock Photo
    Endictya oceanica diatom
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species — Stock Photo
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species
    Close-up of bright blue coral on reef underwater — Stock Photo
    Close-up of bright blue coral on reef underwater
    Phronima amphipod against black background, closeup — Stock Photo
    Phronima amphipod against black background, closeup
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans — Stock Photo
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans
    Radiolaria protozoa shells — Stock Photo
    Radiolaria protozoa shells
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Close-up of bright blue coral on reef underwater — Stock Photo
    Close-up of bright blue coral on reef underwater
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Rutilaria epsilon diatom — Stock Photo
    Rutilaria epsilon diatom
    Coloured scanning electron micrograph (SEM) of the shell (test) of a Globigerina sp. planktonic foraminiferan. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell (test) of a Globigerina sp. planktonic foraminiferan.
    Acrospaera radiolarian shell — Stock Photo
    Acrospaera radiolarian shell
    Shoal of fishes in an aquarium, one of them is going the opposite way the others — Stock Photo
    Shoal of fishes in an aquarium, one of them is going the opposite way the others
    Dark field light micrograph (LM) of freshwater pennate diatoms. — Stock Photo
    Dark field light micrograph (LM) of freshwater pennate diatoms.
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae. — Stock Photo
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae.
    Acrospaera radiolarian shell — Stock Photo
    Acrospaera radiolarian shell
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp
    Liradiscus sp. planktonic unicellular algae — Stock Photo
    Liradiscus sp. planktonic unicellular algae
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species — Stock Photo
    Diatoms. Coloured scanning electron micrograph (SEM) of Campylodiscus species diatoms. The diatoms are a group of photosynthetic, single-celled algae containing about 100, 000 species
    Aulacodiscus oregonus diatom — Stock Photo
    Aulacodiscus oregonus diatom
    Big corals in water with people diving on background — Stock Photo
    Big corals in water with people diving on background
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Bacteriastrum sp. diatom algae — Stock Photo
    Bacteriastrum sp. diatom algae
    Rutilaria epsilon diatom — Stock Photo
    Rutilaria epsilon diatom
    Marine pennate diatom frustule — Stock Photo
    Marine pennate diatom frustule
    Group of little barracudas on reef in sea water — Stock Photo
    Group of little barracudas on reef in sea water
    Jellyfish drifting near water surface — Stock Photo
    Jellyfish drifting near water surface
    Closeup view of yellow antler corals in azure sea — Stock Photo
    Closeup view of yellow antler corals in azure sea
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans. — Stock Photo
    Three dinoflagellates (blue), coloured scanning electron micrograph (SEM). Dinoflagellates are unicellular protozoans.
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM). — Stock Photo
    Water flea (Polyphemus pediculus), coloured scanning electron micrograph (SEM).
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda). — Stock Photo
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda).
    Silica wall of a diatom — Stock Photo
    Silica wall of a diatom
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Centric fossil diatom frustule — Stock Photo
    Centric fossil diatom frustule
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae. — Stock Photo
    Coloured scanning electron micrograph of fresh water centric diatoms frustules type of algae.
    Star trails and bioluminescence in Gippsland lake — Stock Photo
    Star trails and bioluminescence in Gippsland lake
    Colorful exotic fish near reef underwater — Stock Photo
    Colorful exotic fish near reef underwater
    Closeup of fish group floating in blue water between corals — Stock Photo
    Closeup of fish group floating in blue water between corals
    Arachnoidiscus sp. diatom algae — Stock Photo
    Arachnoidiscus sp. diatom algae
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Big corals in water with people diving on background — Stock Photo
    Big corals in water with people diving on background
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda). — Stock Photo
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda).
    Phytoplankton diatom Coscinodiscus sp — Stock Photo
    Phytoplankton diatom Coscinodiscus sp
    White-spotted jellyfish near Lesser Sunda Islands — Stock Photo
    White-spotted jellyfish near Lesser Sunda Islands
    Differential interference contrast light micrograph of different species of fossil unicellular radiolarians (protozoa). — Stock Photo
    Differential interference contrast light micrograph of different species of fossil unicellular radiolarians (protozoa).
    Amazing transparent Antarctic krill with red spots among haze of cold ocean water on black background — Stock Photo
    Amazing transparent Antarctic krill with red spots among haze of cold ocean water on black background
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp. — Stock Photo
    Coloured scanning electron micrograph (SEM) of the shell of the foraminiferan Orbulina sp.
    Shoal of little silver fish underwater — Stock Photo
    Shoal of little silver fish underwater
    Marine planktonic unicellular alga — Stock Photo
    Marine planktonic unicellular alga
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans — Stock Photo
    Plankton. Coloured scanning electron micrograph (SEM) of plankton containing mainly Ceratium dinoflagellates. A few diatoms are also present. Dinoflagellates are unicellular protozoans