Question

all the animals within the phylum chordata... possess a spinal cord. possess all these traits. are warm - blooded. have lungs.

Explanation:

Chordates are a diverse group. While some chordates may have a spinal cord (in vertebrates, a part of the chordate sub - group), not all chordates (like tunicates and lancelets) have a true spinal cord. Many chordates are not warm - blooded (e.g., most fish, amphibians, and reptiles which are chordates are cold - blooded). Also, not all chordates have lungs (fish have gills). But the defining characteristics of chordates (at some stage of their life cycle) include a notochord, dorsal nerve cord (which in vertebrates develops into a spinal cord), pharyngeal slits, and a post - anal tail. So the most accurate answer is that they possess all these traits (referring to the chordate - defining traits, not the incorrect options like warm - bloodedness or having lungs in all cases).

Answer:

possess all these traits.