Short answers, pulled from the story.
Algae describes a vast collection of photosynthetic organisms that are not land plants. These creatures range from microscopic single cells to massive kelp forests stretching fifty meters long. Most species live in water and lack the specialized tissues found in trees or flowers.
Fossilized filamentous algae from the Vindhya basin date back 1.6 to 1.7 billion years ago. Stromatolites associated with cyanobacteria appear in the fossil record as early as 3500 million years ago. Eukaryotic algae emerged more than 1.5 billion years ago during the Calymmian period.
Ancylonema nordenskioeldii was found in Greenland's Dark Zone causing increased ice sheet melting rates. Pink ice appeared on parts of the Presena glacier in the Italian Alps due to the same species. This organism contributes to environmental changes through its presence on ice sheets.
Linnaeus recognized fourteen genera of algae in his 1753 work Species Plantarum. Only four of those genera remain classified among algae today. Samuel Gottlieb Gmelin published Historia Fucorum in 1768 as the first book dedicated to marine algae using binomial nomenclature.
Klamath AFA is harvested only from Upper Klamath Lake in Oregon. Chlorella contains photosynthetic pigments found in freshwater environments. Spirulina serves as both food source and nutritional supplement for consumers.