According to the phylogeny in the figure below,which of the following statements is true?
A)All chordates have a neural tube.
B)Echinoderms have a neural tube.
C)Amphioxus have a neural crest.
D)All chordates have a neural crest.

Question

According to the phylogeny in the figure below,which of the following statements is true? 
A)All chordates have a neural tube. 
B)Echinoderms have a neural tube. 
C)Amphioxus have a neural crest. 
D)All chordates have a neural crest.

Quizplus · Accepted Answer

The phylogeny shows that all chordates have a neural tube, as it is present in all the groups (cephalochordates, urochordates, and vertebrates) that are included in the chordate clade. Echinoderms, on the other hand, do not have a neural tube, and neither do they have a neural crest. Amphioxus, which is a cephalochordate, does have a neural crest, but not all chordates necessarily have it. Therefore, option A is the correct choice.

According to the Phylogeny in the Figure Below,which of the Following