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  • PNAS
    Explore groundbreaking research and discoveries published in the Proceedings of the National Academy of Sciences (PNAS) journal, covering diverse scientific disciplines
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  • Invertebrate Definition and Examples - Biology Online
    Characteristics of Invertebrates Invertebrates belong to the animal kingdom In fact, most animals in the kingdom Animalia are invertebrates Only one phylum (i e the phylum Chordata) of the approximate 35 phyla is composed of animals with backbones (they are called vertebrates) (Ref
  • Chapter 11 Lesson 3 What defines an animal? Flashcards - Quizlet
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  • biology unit 7 Flashcards - Quizlet
    a state in which an animal's breathing rate slows down to only a few breaths per minute and the body temperature drops substantially
  • 5. 7: Invertebrates - Biology LibreTexts
    Invertebrate animals are those without a cranium and defined vertebral column or spine In addition to lacking a spine, most invertebrates also lack an endoskeleton A large number of invertebrates are aquatic animals, and scientific research suggests that many of the world’s species are aquatic invertebrates that have not yet been documented





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