00:01
When we study evolution, we see that certain animals evolved first and then the other organisms evolved from that particular organism.
00:16
So they have a lineage or they have a phylogenetic relationship.
00:21
Whenever we study evolution, we study phylogenetic relationships between the organisms and then we classify them into the classes and kingdoms.
00:34
So when we study about animal kingdom, we see that in animal kingdom, the first group of animals were to evolve on this planet were sponges.
00:48
Sponges are kept in class poriphera.
00:52
They are aquatic organisms and they evolved around 660 to 635 million years ago during the neoproterozoic era.
01:07
So they evolved during the neoproterozoic era around 660 million years ago.
01:16
Now after sponges, there were organisms like coelant rates, tenophoras, then we had platyhelminthus, or also we call them as the flatworms in which our tapeworm comes.
01:31
Now these probably evolved around 550 million years ago.
01:36
After flatworms, we had roundworms or asclementis.
01:41
Then we have annelids in which we put earthworms...