Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals

The correct answer is option D.

Explanation:

Invertebrates don’t have a common similarity in an anatomical structure that all have. They are different in their structure so they should not be grouped into one group.

All different groups of invertebrates have a different type of symmetry, composition, and anatomically different but there is not a common character except the fact that no one has vertebra.  

Thus, the correct answer is option D.

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climate change and pollution