This is the Photosynthetic Cyanobacteria. it was the ability of this unicellular organisms million of years ago, through photosynthesis; that lead to the emergence of separate singular organisms the plants. Plants constantly undergo photosynthesis as it absorbs CO2, and make use of sunlight to to produce carbohydrates for animals to survive. And this leads to the emergence of animals which feeds on the plants, and therefore re population of the Earth occurs.
