Mammals, reptiles, birds, and fish all belong to which phylum?

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Multiple Choice

Mammals, reptiles, birds, and fish all belong to which phylum?

Explanation:
All four groups are chordates, a group defined by certain structures that appear during development. In chordates you’ll find a notochord and a dorsal hollow nerve cord at some stage, along with pharyngeal slits and a post-anal tail. In vertebrates like mammals, reptiles, birds, and fish, the notochord is typically replaced by a backbone, giving them the backbone-bearing trait that helps place them in this phylum. The other listed phyla (Arthropoda, Mollusca, Echinodermata) lack these chordate features, so they are classified outside this phylum. So, mammals, reptiles, birds, and fish all belong to Chordata.

All four groups are chordates, a group defined by certain structures that appear during development. In chordates you’ll find a notochord and a dorsal hollow nerve cord at some stage, along with pharyngeal slits and a post-anal tail. In vertebrates like mammals, reptiles, birds, and fish, the notochord is typically replaced by a backbone, giving them the backbone-bearing trait that helps place them in this phylum. The other listed phyla (Arthropoda, Mollusca, Echinodermata) lack these chordate features, so they are classified outside this phylum. So, mammals, reptiles, birds, and fish all belong to Chordata.

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