The first animals to resemble modern dolphins evolved ca. 20 million years ago.
23 years ago
From the research from the last 10 years there are almost 40 different species of dolphins. It is said that the number of species of dolphins was much less than this million of years ago.
They began to evolve 600,000 years ago. They died out 27,000 years ago.
The process of defecation evolved many millions of years ago as part of evolution
They began to evolve 600,000 years ago. They were totally developed 130,000 years ago. They died out 27,000 years ago.
They started evolving about 600,000 years ago. They were completely evolved by 130,000 years ago.
3.5 billion years ago.
They began to evolve 600,000 years ago, reaching full development 130,000 years ago. They died out 27,000 years ago.
50-60 million years ago.
395 Million years ago
50-60 million years ago.
a very very long time ago about 20-30 years ago