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Classification question

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    The common frog and viper (snake) are grouped in the phylum Chordata. The viper and chameleon are grouped in the class Reptalia. Identify whether the frog or the chameleon shares more characteristics with the viper. Explain why. (2 marks)

    Can anybody help? I don't understand this. The answer is Chameleon, but I don't see how a Chameleon would share more characteristics with a viper, than a frog that shares the same phylum with the viper itself.

    The frog shares the same phylum with the viper but the chameleon shares the same class with the viper.

    A class is a more specific category than a phylum: the phylum Chordata includes, among some other organisms, all vertebrates (mammals, bird, reptiles etc.) whereas the class Reptilia will only contain reptiles.
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