Four of the Following Statements are True

Question

Four of the following statements are true.Which one is not?  
A) Amniotes are the predominant vertebrates on land.
B) Tetrapod vertebrates have four bony limbs.
C) All chordate embryos have a notochord, a dorsal tubular nerve cord.
D) Lancelets and tunicates are the two groups of invertebrate chordates.
E) The backbone and the other skeletal elements are components of the vertebrate exoskeleton.

Accepted Answer

The backbone and skeletal elements are components of the vertebrate endoskeleton, which is located within the body, rather than the exoskeleton, which is external. The other statements are true: amniotes are the predominant vertebrates on land, tetrapod vertebrates have four bony limbs, all chordate embryos have a notochord and dorsal tubular nerve cord, and lancelets and tunicates are the two groups of invertebrate chordates.