What class does Anabaena belong to?

Bacteria and bacterial diseases (infections by bacteria, general or unspecified)

Nostocales, an order of cyanobacteria containing most of its species

prokaryote (organism without membrane bound intra-cellular structures)

Cyanobacteria, a phylum of bacteria that obtain their energy through photosynthesis

cell (a basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals)

Nostocaceae, a family of cyanobacteria that forms filament-shaped colonies enclosed in mucus or a gelatinous sheath

object with a length or height (an object that can be described as short in some sense)

object with a mass (an object where it makes sense to talk about its weight)

visible object (something which reflects or emits light)

object which does not exist forever

object with a height (an object where it makes sense to talk about its height)

organism (any single or multi-celled living thing, not a virus)

entity (any object at all, conceptual or physical)

individual object (object which is an individual thing - not a class, relation or attribute)

biological object

microorganism (an organism too small to see with the naked eye)

natural object (an object occurring naturally; not made by man)

physical object classified by property (such as one that belongs in the class of objects with a mass)

non-human organism (an organism which is not a human being)