Chordate

... had generation times shorter than 20 years.) In fact, our digestive system has had a thousand times longer than that to evolve. The earliest know chordate fossil dates from 550 million years ago, and it would have already had a functioning digestive system to survive. What’s more, the field of ...

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... for them too ;) 4. Common traits in embryos. Humans, dogs, snakes, fish, monkeys, eels (and many more life forms) are all considered "chordates" because we belong to the phylum Chordata. One of the features of this phylum is that, as embryos, all these life forms have gill slits, ...

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... modified’ book? 4. Common traits in embryos. Humans, dogs, snakes, fish, monkeys, eels (and many more life forms) are all considered "chordates" because we belong to the phylum Chordata. One of the features of this phylum is that, as embryos, all these life forms have gill slits, ...

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first of all, the opposite of invertebrate is not vertebrate, it is chordate. I would think arthropods would be a better opposite. wouldn't annelid be a better opposite? or rather let it go down to monera groups :wink:

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... development of different cell layers (germ layers) and formation of some crucial body structures such as the neural tube and the notochord in chordate animals. Until this and even bit further, all vertebrates follow a very identical developmental path. How the eyes end up in the head and digits ...

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