Overview of natural history. Breakdown of time. Different periods of Earth’s history are broken into sets of time just like a year is broken into months, weeks, days and hours Earth history is broken into eons, eras, periods, epochs . Eons – Millions and Billions of years .By odakota
Origin and Evolution of Reptiles. Introduction. Introduction. From studies of fossils and comparative anatomy, zoologists infer that reptiles arose from amphibians. The oldest known fossils of reptiles are about 350 million-years-old.By raja
Reptiles, Mammals, and Birds. Reptiles, Birds, & Mammals. Amphibians. ~400 MYA. Early Reptiles: Reptilomorphs. The earliest ancestors of reptiles are reptile-like amphibians. Remember: what is THE defining characteristic of an amphibian?By hera
Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES. The Early Reptiles. Dinosaurs – lost in the mass extinction. Mass extinction – hit of an asteroid; global broiling hypothesis. Some survived – evolved in forests, swamps & open habitats.By esben
真正陆生的变温、羊膜动物. －爬行纲（ Reptilia）. THE REPTILES PHYLUM CHORDATA CLASS REPTILIA. Repti1es are the first truly terrestrial vertebrates.By megan
Early Anthropods. Anthropods emerge from sea Preadapted- possessions of adaptations usable for life on land by chance ie- exoskeletons- waterproof Breathing- development of tracheae (small tubes with adjustable holes in the exoskeleton for air)By cecilia-hess
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