00:01
We have four main characteristics that are unique to chordates.
00:05
It's the noticord, the dorsal hollow nerve cord, the post -anal tail, and the pharyngeal slits.
00:12
So let's start with the noticord.
00:15
The noticord is a flexible and cartilage rod that extends all the way through the back of the organism, as you can see in this picture.
00:25
And usually exists mostly in emeraldogical development, and then in most adults, it's not exist anymore, but in some it may.
00:35
Our hollow dorsal nerve cord usually becomes the central nervous system, which is the brain and the spinal cord.
00:43
It's unique in chordates because it's dorsal, which means it's running along the back of the organism, and it's tubular.
00:52
For our gills, our pharyngeal slits, they can have different functions.
00:59
In vertebrates, they usually lead to filter feeding.
01:03
But in fish, vertebrates, they become gills...