4steps from the big bang
34things can go into it
eye
ComponentPart
The first eyes appeared around 540 million years ago. Seeing may have helped spark the Cambrian explosion of animal life.
First appearedAbout 540 million years ago
Made Of
Everything is made of something.← What it takes
What it leads to →
Made from
The first eyes appeared around 540 million years ago. Seeing may have helped spark the Cambrian explosion of animal life.
From the big bang to eye
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
amino acidsdate unknown
proteinsc. 4.2 bn yrs ago
eyec. 540 m yrs ago