Consider the question. What has a nervous system?
Options:
- (A) animals
- (B) tortoises
- (C) crocodiles
- (D) sponges
- (E) elephants
- (F) placozoans
- (G) mesozoans
- (H) insects
 If the answer is '(H)'; explain the reasoning:
Most invertebrates have a nervous system. Insects are the most common invertebrates. Insects have a nervous system.