Which Phylum designation does Crotalus atrox share with earthworms and blue whales?
Answer
Chordata.
The Phylum Chordata represents a broad grouping within the Kingdom Animalia, specifically identifying organisms that possess a notochord or a backbone at some stage of their development. This classification is shared across immensely diverse organisms, including invertebrates like those with a notochord and vertebrates such as mammals (blue whales) and reptiles (*Crotalus atrox*). While Animalia is the highest grouping listed, Chordata provides the crucial shared characteristic of a spinal column structure.
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