There are two main theories on this. The first is that they were made approximately 4,000 or 5,000 years ago--these were sea mammals.
The other theory says that they evolved over millions of years from protozoa-type things so the first vertebrates were probably frog-like creatures according to this theory.
The first vertebrates appeared 530 million years ago.
No, the first vertebrates evolved long before the Mesozoic. The first vertebrates, small jawless fish, evolved around 520 million years ago. Land animals had even evolved long before the Mesozoic Era.
About 230 million years ago.
on the 12th of march
Around 400 million years ago, in the Devonian, the age of sharks and early amphibians.
A Long...Long....Long....Long......Long....Long.....Long...Long.......Long.....Long....Long..Long Time Ago XD
they lived about 3 millon years ago. : )
a while ago
two millon years ago
8.1 billion years ago
Completely evolved Neanderthals appeared 130,000 years ago.
No. The 1st vertebrates appeared in the fossil record about 525 million years ago during the Cambrian Period. This was in the Paleozoic Era.
3 years ago