Diatoms - Microscopic single-celled algae
However, this process does not last indefinitely. When the minimum size limit is exceeded, the genital unarmored generation (the so-called auxospore) generally appears in the sea. Which has the ability to grow unhindered – and then the cycle begins again… 25 We owe the percentage of oxygen in the Earth’s atmosphere to diatoms, which produce it in the process of photosynthesis. They also make up a quarter of the biomass found in all seas and oceans.