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My answer is : Invertebrates are those that do not possess a vertebral column or backbone while Vertebrates are those where vertebral column or backbone is present. Vertebrates are more complex organisms when compared to invertebrates. The primary difference between the two is that vertebrates possess a backbone and an internal skeleton. One of the most primary characteristics is the absence of a spinal cord. This means that the members under this class also lack a hard, bony internal skeleton. However, in some members, a hard, exterior structure called the exoskeleton is present, which provides structural strength and protection from predators and environment (e.g., crabs, lobsters and ammonites.) Most of the members are motile, but there are exceptions like the sea sponge. Vertebrates are more complex organisms when compared to invertebrates. The primary difference between the two is that vertebrates possess a backbone and an internal skeleton. In some vertebrates, the bones are replaced with cartilage, as seen in sharks. Another defining characteristic of vertebrates is that they reproduce sexually.
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