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Lecture 20 Invertebrates 1 pdf

Lecture 20 Invertebrates 1 pdf - Invertebrates 1 An...

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1 Dr. Andy Gracey BISC 120 Section 3 Invertebrates 1: An Introduction to Animal Diversity Welcome to Your Kingdom Animal diversity Man Ecology Ecosystem 1.3 million living species of animals have been identified Biosphere What defines animals? Animals are multicellular, heterotrophic eukaryotes with tissues that develop from embryonic layers 1. Multicellular, heterotrophic eukaryotes 2. Lack the cell walls of plants and fungi 3. Two unique tissues: nerves & muscles 4. Sexual reproduction, diploid adult stage 5. All have Homeotic ( Hox ) genes regulating early development
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