What characteristics are unique to vertebrates

There are actually five characteristics that all vertebrate have in common; a vertebral column composed of multiple vertebrae (spine), a cranium (the bone that envelopes the brain) , a closed circulatory system, nural crest , and a pronounced cephalization .

The virus is considered to be are living item since they have hereditary material dnas or rnas. they can imitate and change. they respond to boosts, for example, radiation, chemicals, and warmth. they have antigenic properties. they are proficient to duplicate with a same hereditary constituent.

If the experiment was perfomed more then once and you get the same results