ARCHAIC ERA

ARCHAIC ERA
from 4.5 billion to 500 million years ago
(or Archeozoic)

4.5 billion years ago
The Earth formed
with large expanses of water from which land masses began to emerge.

After many transformations, it became suitable to host the first forms of life.

3.5 billion years ago
Unicellular organisms
(one cell)

BACTERIA

700 million years ago
More complex multicellular organisms
(more cells)

JELLYFISH

630 million years ago
Some algae began to produce a special gas: OXYGEN

GREEN ALGAE

FUNDAMENTAL FOR THE DEVELOPMENT OF OTHER LIVING BEINGS

ARCHAIC – PRIMARY