Transcription: In this lesson, we'll continue our discussion on the animal kingdom. In our previous lesson, we talked about the animals that didn't have backbones, the invertebrates. In this lesson, we'll talk about the animals that do have backbones, called the vertebrates. But let's make a connection between the two types of animals. The last subphylum we talked about in the invertebrate lesson dealt with the urocordates and their characteristics. We'll see that these same characteristics of the nodal cord, the nerve cord, The gill slits and the tail are present in some form in the vertebrates. The differe ...
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