What has a nervous system?
animals tortoises crocodiles sponges elephants placozoans mesozoans insects
A B C D E F G H
Insects are the most common invertebrates.
Insects have a nervous system.
What has a nervous system? (A) animals (B) tortoises (C) crocodiles (D) sponges (E) elephants (F) placozoans (G) mesozoans (H) insects