Tags: alga, algae, algal, aquatic, biological, biology, botanical, botany, cell wall, circle, circular, coloured, diatom, eukaryotic, false colour, false coloured, flora, freshwater, frustule, heterokont, heterokontophyta, marine, microbiological, microbiology, mineralised, nature, one, photosynthetic, soil, protist, protista, round, scanning electron micrograph, scanning electron microscope, sem, single, single celled, specialised, specialized, unicellular
