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Delve into defining characteristics of multicellular eukaryotic animals, from nutrition to invertebrates. Learn about Phylum Chordata's classes and evolutionary obstacles in transitioning from aquatic to terrestrial life.
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The Animal Kingdom II (Lions & Tigers & Bears)Oh my!
Defining Characteristics • (multicellular eukaryotes) • Nutrition by ingestion • No cell walls
Most animals are • INVERTEBRATES!!(no internal skeleton)
Remember Taxons: • Domain • Kingdom • Phylum • Class • Order • Family • Genus • Species
Animal Kingdom • Phylum Chordata has 5 classes: • Fish • Amphibians • Reptiles • Birds • Mammals
Evolutionary Obstacles Adapting from aquatic terrestrial life:Two important “obstacles” for animals: • Obtaining oxygen for aerobic cellular respiration (in order to release energy from food!) • Sexual Reproduction without water
Evolutionary Trends ** Reproduction Strategy ** • From: More offspring; low or no level of parental care • To: Fewer offspring; high level of parental care