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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).
    Campylodiscus fastuosus diatom — Stock Photo
    Campylodiscus fastuosus diatom
    Big corals in water with people diving on background — Stock Photo
    Big corals in water with people diving on background
    Freshwater diatom Licmorpha sp. — Stock Photo
    Freshwater diatom Licmorpha sp.
    Shoal of little silver fish underwater — Stock Photo
    Shoal of little silver fish underwater
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Diatom eukaryotic algae — Stock Photo
    Diatom eukaryotic algae
    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.
    Lychnocanoma radiolarian shell — Stock Photo
    Lychnocanoma radiolarian shell
    Freshwater diatom Licmorpha sp. — Stock Photo
    Freshwater diatom Licmorpha sp.
    Marine biodiversity with colorful sea of coral reef in tropical clear water — Stock Photo
    Marine biodiversity with colorful sea of coral reef in tropical clear water
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand. — Stock Photo
    Coloured scanning electron micrograph (SEM) of a foraminiferan microfossil from maldives beach sand.
    Liradiscus sp. planktonic unicellular algae — Stock Photo
    Liradiscus sp. planktonic unicellular algae
    Shell of a radiolarian — Stock Photo
    Shell of a radiolarian
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Shoal of beautiful fishes in azure water — Stock Photo
    Shoal of beautiful fishes in azure water
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Arachnoidiscus sp. diatom algae — Stock Photo
    Arachnoidiscus sp. diatom algae
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae. — Stock Photo
    Colored scanning electron micrograph of diatoms photosynthetic single-celled algae.
    Big corals in water with people diving on background — Stock Photo
    Big corals in water with people diving on background
    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.
    Radiolaria protozoa shells — Stock Photo
    Radiolaria protozoa shells
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Close-up of bright blue coral on reef underwater — Stock Photo
    Close-up of bright blue coral on reef underwater
    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.
    Radiolarians amoeboid protozoa — Stock Photo
    Radiolarians amoeboid protozoa
    Planktonic unicellular alga Diploneis sp. — Stock Photo
    Planktonic unicellular alga Diploneis sp.
    Silica wall of a diatom — Stock Photo
    Silica wall of a diatom
    Marine pennate diatom frustule — Stock Photo
    Marine pennate diatom frustule
    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
    Photosynthetic Navicula sp. diatom — Stock Photo
    Photosynthetic Navicula sp. diatom
    Colorful exotic fish near reef underwater — Stock Photo
    Colorful exotic fish near reef underwater
    Freshwater single diatom — Stock Photo
    Freshwater single diatom
    Eupodiscus sculptus diatom — Stock Photo
    Eupodiscus sculptus diatom
    Aulacodiscus oregonus diatom — Stock Photo
    Aulacodiscus oregonus diatom
    Salt water pennate diatom frustule — Stock Photo
    Salt water pennate diatom frustule
    Marine biodiversity with colorful sea of coral reef in tropical clear water — Stock Photo
    Marine biodiversity with colorful sea of coral reef in tropical clear water
    Eupodiscus sculptus diatom — Stock Photo
    Eupodiscus sculptus diatom
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda). — Stock Photo
    Scanning electron micrograph (SEM) of a copepod (subclass Copepoda).
    Freshwater single diatom — Stock Photo
    Freshwater single diatom