Ocean Life

Stage 01

Life began in the depths. Simple, drifting organisms turned the tides of history—starting a chain of change that would reshape the planet.

0 First Life (BYA)

0 Earth's Surface Water

0 Species Undiscovered

Scientific Overview

THE PRIMORDIAL SEAS

Approximately 3.5 billion years ago, the first living organisms emerged in Earth's oceans. These microscopic life forms, primarily bacteria and archaea, laid the foundation for all subsequent life on our planet. The ocean provided the perfect environment—water to dissolve nutrients, protection from harmful UV radiation, and a stable temperature.

Did You Know?

OCEAN MYSTERIES

The earliest organisms didn't need oxygen. They thrived on chemical energy from underwater vents—slowly building the biological toolkit that would later power entire ecosystems.

Photosynthesis Changed Everything

Cyanobacteria evolved photosynthesis 2.4 billion years ago, releasing oxygen and transforming Earth's atmosphere forever.

The First Eyes

The first eyes evolved in the ocean approximately 540 million years ago, sparking an evolutionary arms race.

Jellyfish Are Ancient

Jellyfish are 95% water and have existed for over 500 million years, making them older than dinosaurs.

Timeline

OCEAN EVOLUTION MILESTONES

3.5 BYA

First Life

2.4 BYA

Photosynthesis

540 MYA

First Eyes

500 MYA

First Fish

OCEAN LIFE GALLERY

Featured Species

NOTABLE OCEAN CREATURES

Extinct

Ammonite

Spiral-shelled cephalopods that thrived for 350 million years.

Extinct

Trilobite

Ancient arthropods among the earliest animals with complex eyes.

Extant

Jellyfish

Gelatinous creatures that have drifted through oceans for 500 million years.

DIVE DEEPER?

Continue your journey through time and discover what came next in the evolution of life.

Next: Dinosaur Era