Which of the following statements best describes the evolution of chordates?
A. Chordates evolved from simple nonvertebrates and branched into several directions based on evolutionary needs.
B. Chordates evolved from a common invertebrate ancestor and evolved into aquatic chordates that would undergo a series of adaptations and eventually move to terrestrial habitats.
C. Chordates evolved from an extinct group of simple chordates that branched off from nonvertebrates.
D. Chordates evolved from nonvertebrates into separate aquatic and terrestrial groups of vertebrates.

Question

Which of the following statements best describes the evolution of chordates?
A. Chordates evolved from simple nonvertebrates and branched into several directions based on evolutionary needs.		
B. Chordates evolved from a common invertebrate ancestor and evolved into aquatic chordates that would undergo a series of adaptations and eventually move to terrestrial habitats.
C. Chordates evolved from an extinct group of simple chordates that branched off from nonvertebrates.		
D. Chordates evolved from nonvertebrates into separate aquatic and terrestrial groups of vertebrates.

anonymous · Answer

I can't decide, at least 3 of them are actually almost true...

But if I need to pick one as the best, it would be that Chordates evolved from a common invertebrate ancestor and evolved into aquatic chordates (that would undergo a series of adaptations and eventually move to terrestrial habitats.) because this describes best the general hierarchy of Evolutionary process.