The Nitrogenerator is one of the simplest organisms a user can make.
The Nitrogenerator is composed of two cells: a Photocyte, which photosinthesizes and generates nutrients, and a Nitrocyte, which generates nitrates for the organism to use. Due to its compact size and how it generates nutrients and nitrates in such a fast pace, it starts reproducing almost immediately after putting one in a plate.
It can live in places where there is no nitrates because it generates its own ones. It can't move, so it's vulnerable to Nitrogenerating predators.