The phylum Chordata includes a diverse range of animals, and while many possess certain common traits, not all chordates have all the characteristics mentioned. Here’s a brief overview:
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Cold-blooded: Not all chordates are cold-blooded (ectothermic); mammals and birds, for example, are warm-blooded (endothermic).
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Have limbs: Many chordates, such as mammals, birds, and reptiles, have limbs, but other groups, like some species of fish and amphibians in their larval stages, do not have limbs in their adult forms.
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Have a well-developed brain: While many chordates have a brain and complex nervous systems (especially vertebrates), some invertebrate chordates (like tunicates and lancelets) have simpler nervous systems.
In summary, chordates do not collectively possess all these traits; they show a wide variety of characteristics depending on the specific group within the phylum.