Question

Which of the following best describes why invertebrates isn't considered a scientifically valid word when classifying animals? A. The term invertebrates describes all animals, so is not helpful in classifying organisms within the animal kingdom. B. The term invertebrates is unhelpful because all animals possess some sort of backbone or notochord. C. The term invertebrates classifies animals haphazardly based on a missing characteristic rather than a common one. D. The term invertebrates is too vague, since all animals evolved from single-celled organisms without a backbone.

Answer 1

C. The term invertebrates classify animals haphazardly based on a missing characteristic rather than a common one.

Not all animals have a notochord, not all are invertebrates.