The multicellular animal carries the primordial soup inside a shell of skin. It thus travels on land, but must return to sea to spawn.
On land the skin is a dead barrier to external viruses, animals cannot spawn through the skin. Hence, sex, a way to share primordial soups. It is a net flow, so has a male and female duality. Allows us to spawn on land. Illustrates a duality, or line of symmetry, in nature.
There is a life,death axis. The biology needs to sacrifice cells and energy to keep the barrier strong. Inside the soup are organelles dedicated to death, part of the immune system. It has a semi-independent evolution. The inherent spawning mechanism has to overcome that barrier. The conflict is the source of emotional imbalances. The better our defenses, the more compact we allow ourselves. So we can see how Freud got from Civilization and its Discontents to life and death instinct.
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