Video Transcript
An octopus, pictured, is an
invertebrate, so it does not have blank. (A) A specialized nervous system,
(B) the ability to reproduce, (C) a backbone, (D) specialized sex organs, or (E) a
circulatory system.
The kingdom Animalia can be divided
into two groups vertebrates and invertebrates. The difference between these groups
is the presence of a vertebral column, also known as a backbone. Invertebrates, such as jellyfish,
crustaceans, and insects, do not have a backbone, while vertebrates do have one. Octopus are invertebrates. This is because they do not have
(C), a backbone.
