NAD (Nicotinamide-adenine-dinucleotide) is a coenzyme found in cells. It is a dinucleotide, insofar as the molecule consists of a first nucleotide, whose nucleic base is adenine, united to a second nucleotide, the base of which is nicotinamide. NAD exists in an oxidized form, denoted NAD+, and a reduced form, denoted NADH.
A good topic idea that could be used can be about ecosystems. Such as how geographic area, plants, animals, weather and landscape make up the types of organisms in that specific ecosystem.
