BIOLOGY - LOS CORDADOS

I am writing for showing you what is the origin of  human live according to biology .We are all chordates (Cordados) which means that we have a nerve cord .The first animals to have it ,they were like worms and they were the first vertebrates on earth.The difference is that instead of having a spinal column as humans, they have a Notocord made by the same components: Calcium and proteins.

I'll show you a video about this incredible animals and for completing these information.

ALEJANDRO FERNÁNDEZ MORALES