Made Of

Everything is made of something.

← What it takes

What it leads to →

Evolved from

amphibians

Needs

air

4steps from the big bang

46things can go into it

early amniotes

NaturalLiving

The first animals to lay eggs with shells, about 320 million years ago. Their descendants split into two lines: reptiles and synapsids.

First appearedAbout 320 million years ago

Evolved into

reptilessynapsids

The first animals to lay eggs with shells, about 320 million years ago. Their descendants split into two lines: reptiles and synapsids.

From the big bang to early amniotes

The most direct chain from the start of the universe, following what things are made from and, for living things, what they evolved from. Each step shows when it first appeared.

big bang13.8 bn yrs ago

Hhydrogen13.8 bn yrs ago

water4.4 bn yrs ago

amphibiansc. 370 m yrs ago

early amniotesc. 320 m yrs ago