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Biological Evolution: Unity and Diversity: Vertebrates and Invertebrates
Chordates
Description
Chordates
Chordates are a large group of animals that share important features at some stage of development such as a notochord, dorsal nerve cord, and gill slits—including fish, amphibians, reptiles, birds, and mammals. Studying chordates helps understand the evolutionary relationships between ...
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Transcript
What do fish, birds, mammals, and even simple sea creatures like sea squirts have in common? They all belong to a group called chordates.
Even though chordates look different, they all have four key traits.
First, they have a post-anal tail, which extends beyond the anus and helps with movement. Some chordates, like fish and reptiles...
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