Chapter 31 Intro to Animals

Chapter 31 Intro to Animals - Chapter 31: Intro to Animals...

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Chapter 31: Intro to Animals --Animals are a monophyletic group that can be recognized by three traits: (1) They are multicellular. (2) They are heterotrophs— they ingest their food. (3) They move under their own power at some point in their life cycle. I.Why do Biologists study Animals? A. They are heterotrophs—so must be understood to understand ecosystems; very diverse, so must be understood to understand the history of life; we rely on them for food and transportation; helpful with understanding human biology II. How do Biologists study Animals? A. In addition to multicellularity, eating, and moving, several other traits are shared by animals: i. Animal cells have no cell walls (have extensive ETM w proteins for cell adhesion and communication) ii. Animals are the only lineage with muscle and nerve tissue. iii. No animals undergo alternation of generations. (although there’s animals that use asexual, and others that use sexual) iv. Adults of most species are diploid; only gametes are haploid. B. There are only a handful of ways an animal’s body parts are put together, despite the kingdom’s vast diversity. Therefore, they are distinguished by their core body plan —an animal’s architecture, or the major features of its structural and functional design. 4 features that define the basic elements of an animal’s body plan: i. (1)number of tissues in embryo ii. (2) type of body symmetry and degree of cephalization (head formation) iii. (3) presence or absence of a fluid-filled cavity iv. (4) How the earliest events in the development of an embryo succeed. C.
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Chapter 31 Intro to Animals - Chapter 31: Intro to Animals...

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