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Animal Diversity

Evolution and Diversity

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Biology
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The Origins of Life Todays Atmosphere Contains 78% Nitrogen and 21% Oxygen Also has small amounts of CO2, helium and, neon ? Heterotroph hypothesis: a theory which stated that there was more lightning, volcanic activity, and UV radiation H2, NH3, CH4, and H2O were the first molecules that were present The early earth DID NOT contain oxygen ? Heterotrophs: first cells in life They can't synthesize their own food ? Autotrophs: organisms that make their own food using solar energy Formed because food was scarce for heterotrophs Oxygen was a waste product of early autotrophs ? The first organisms in life were anaerobic Today most organisms are aerobic ? Evolution Gene pool: genes of a large population of people ?

Biology Campbell Ed. 9 Chapter 32

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Biology
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campbell
9th edition

Chapter Thirty-Two: An Overview of Animal Diversity Preface Biologists have discovered 1.3 million ?extant? (living) species of animals with estimates running of the actual number of species running much higher. Phylogeny: The history of the evolution of a species or group, especially in reference to lines of descent and relationships among broad groups of organisms. Section 32.1 Animals are multi-cellular (have many cells), heterotrophic (capable of using only organic materials as a source of food), eukaryotes (organism with bound cell organelles and nucleus) that develop from embryonic layers. Animals have several distinguishing characteristics:
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