Invertebrates are the classification of the Animalia that have species with no backbones. Animals are the word that clarifies the meaning of invertebrates. Thus, option D is correct.
Invertebrates are animals that lack a backbone or a vertebral column, unlike vertebrates. They are best described by animals as they are precisely their characteristic and is not seen in plants or other species. They are cold-blooded that include echinoderms, mollusks, arthropods, etc.
Therefore, animals clarify the meaning of invertebrates.
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