Question: Fact 1: Invertebrates are animals that lack a vertebral column, or backbone.  Fact 2: Snails and slugs are invertebrates.  Given the two facts above, answer the question "what do snails and slugs lack?" with the following options:  - eyes  - a nervous system  - kinetic energy  - Chlorophyll  - Energy.  - life  - a backbone  - Energy
Answer:
a backbone