We will divide the forms of life based on:
1. Number of cells
Acellular, unicellular or multicellular, respectively, composed by no cell(such as prions and virus), one cell(such as bacteria) or many cells(such as algae, coconut trees and cats).
2. Structure to locomotion
Stationary, pseudopods, cilia, flagella, tail, paws, legs, wings.
Liquid or dry.
4. Complexity (multicellular only)
Simple or complex, respectively, without specialized cells or with specialized cells.
Obviously, we should have more simple organisms than complex ones. Therefore, it should have more virus than bacteria, more bacteria than multicellular organisms and more of simple multicellular organisms than complex multicellular organisms.
It is true due to the fact of organisms of higher complexity will probably use the organisms of lower complexity as food (such as an ox eating grass), being rare the opposite (such as a carnivorous plant).
By the same reason the simpler structure of locomotion should be prevalent over the complex ones.
Lastly, it is expected that the life begins at a liquid and moves to a dry environment after some time because the liquid can dissolve the chemical substances and facilitate the chemical reactions that are prerequisites to life.
The increase of the complexity of organism is accompanied by the increase of consciousness about the environment and about the organism itself. In fact, we can measure the level of consciousness of an organism by analyzing the size and complexity of its genetic code.