Fact 1: Vertebrates are animals that have a backbone. Fact 2: Invertebrates have no vertebrae or backbone. Given the two facts above, what do some animals not have?

Select from:
[I] nucleus;
[II] fish;
[III] offspring;
[IV] vertebrae;
[V] Chlorophyll;
[VI] invertebrates;
[VII] Energy;
[VIII] Energy.;
Answer:
[IV]