What is an invertebrate?
A. an animal that lacks a backbone and has three cell layers
B. an animal that lacks a backbone, or vertebral column
C. an animal that lacks a backbone and has radial symmetry
D. an animal that lacks a backbone and has an exoskeleton

Question

What is an invertebrate?
A. an animal that lacks a backbone and has three cell layers		
B. an animal that lacks a backbone, or vertebral column
C. an animal that lacks a backbone and has radial symmetry		
D. an animal that lacks a backbone and has an exoskeleton

anonymous · Answer

Invertebrates are animal species that do not develop a vertebral colum, so it is b