A proposal exists that a couple organisms discovered just before the Cambrian period about 555 million years ago were the first arthropods found in the fossil record; by about 530 million years ago trilobites already showed significant diversity and world-wide distribution. There have been multiple mass extinctions inferred from evidence; but basically they've continuously occupied the Earth since.
Around 400 million years ago, in the Devonian, the age of sharks and early amphibians.
how long ago was earth made
2years ago :)
about 65000000 years ago
A long long long time ago.
they were on earth for more than 1,000,000 years ago
about 15,000 years ago!
65 million years ago.
Long ago it was generally thought that the resources of the Earth were effectively infinite and could never be used up.
a long time ago
Millions of years
The Earth is estimated to have formed about 4.5 billion years ago from the solar nebula.