Vertical Evolution
As in eons past for eons hence,
Cells must always bathe in liquids dense,
For gases cannot them sustain
Be they single or be they twain.
Thus to forsake the liquid ocean
They had to organize with caution
Into convenient bags of liquid soup
Classified: The Terrestrial Group!
As in eons past for eons hence,
Humans must always breathe gases dense,
For vacuum cannot them sustain
Be they single or be they twain.
Thus to forsake the gaseous ocean
They have to socialize with caution
Into huge spaceships of gaseous soup
Classified: The Galactic Group!